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Diffstat (limited to 'ffmpeg/libavcodec/mjpegdec.c')
-rw-r--r--ffmpeg/libavcodec/mjpegdec.c1935
1 files changed, 1935 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/mjpegdec.c b/ffmpeg/libavcodec/mjpegdec.c
new file mode 100644
index 0000000..5880fec
--- /dev/null
+++ b/ffmpeg/libavcodec/mjpegdec.c
@@ -0,0 +1,1935 @@
+/*
+ * MJPEG decoder
+ * Copyright (c) 2000, 2001 Fabrice Bellard
+ * Copyright (c) 2003 Alex Beregszaszi
+ * Copyright (c) 2003-2004 Michael Niedermayer
+ *
+ * Support for external huffman table, various fixes (AVID workaround),
+ * aspecting, new decode_frame mechanism and apple mjpeg-b support
+ * by Alex Beregszaszi
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * MJPEG decoder.
+ */
+
+#include "libavutil/imgutils.h"
+#include "libavutil/avassert.h"
+#include "libavutil/opt.h"
+#include "avcodec.h"
+#include "copy_block.h"
+#include "internal.h"
+#include "mjpeg.h"
+#include "mjpegdec.h"
+#include "jpeglsdec.h"
+
+
+static int build_vlc(VLC *vlc, const uint8_t *bits_table,
+ const uint8_t *val_table, int nb_codes,
+ int use_static, int is_ac)
+{
+ uint8_t huff_size[256] = { 0 };
+ uint16_t huff_code[256];
+ uint16_t huff_sym[256];
+ int i;
+
+ av_assert0(nb_codes <= 256);
+
+ ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
+
+ for (i = 0; i < 256; i++)
+ huff_sym[i] = i + 16 * is_ac;
+
+ if (is_ac)
+ huff_sym[0] = 16 * 256;
+
+ return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
+ huff_code, 2, 2, huff_sym, 2, 2, use_static);
+}
+
+static void build_basic_mjpeg_vlc(MJpegDecodeContext *s)
+{
+ build_vlc(&s->vlcs[0][0], avpriv_mjpeg_bits_dc_luminance,
+ avpriv_mjpeg_val_dc, 12, 0, 0);
+ build_vlc(&s->vlcs[0][1], avpriv_mjpeg_bits_dc_chrominance,
+ avpriv_mjpeg_val_dc, 12, 0, 0);
+ build_vlc(&s->vlcs[1][0], avpriv_mjpeg_bits_ac_luminance,
+ avpriv_mjpeg_val_ac_luminance, 251, 0, 1);
+ build_vlc(&s->vlcs[1][1], avpriv_mjpeg_bits_ac_chrominance,
+ avpriv_mjpeg_val_ac_chrominance, 251, 0, 1);
+ build_vlc(&s->vlcs[2][0], avpriv_mjpeg_bits_ac_luminance,
+ avpriv_mjpeg_val_ac_luminance, 251, 0, 0);
+ build_vlc(&s->vlcs[2][1], avpriv_mjpeg_bits_ac_chrominance,
+ avpriv_mjpeg_val_ac_chrominance, 251, 0, 0);
+}
+
+av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
+{
+ MJpegDecodeContext *s = avctx->priv_data;
+
+ if (!s->picture_ptr)
+ s->picture_ptr = &s->picture;
+ avcodec_get_frame_defaults(&s->picture);
+
+ s->avctx = avctx;
+ ff_hpeldsp_init(&s->hdsp, avctx->flags);
+ ff_dsputil_init(&s->dsp, avctx);
+ ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
+ s->buffer_size = 0;
+ s->buffer = NULL;
+ s->start_code = -1;
+ s->first_picture = 1;
+ s->got_picture = 0;
+ s->org_height = avctx->coded_height;
+ avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
+
+ build_basic_mjpeg_vlc(s);
+
+ if (s->extern_huff) {
+ av_log(avctx, AV_LOG_INFO, "using external huffman table\n");
+ init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
+ if (ff_mjpeg_decode_dht(s)) {
+ av_log(avctx, AV_LOG_ERROR,
+ "error using external huffman table, switching back to internal\n");
+ build_basic_mjpeg_vlc(s);
+ }
+ }
+ if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */
+ s->interlace_polarity = 1; /* bottom field first */
+ av_log(avctx, AV_LOG_DEBUG, "bottom field first\n");
+ }
+ if (avctx->codec->id == AV_CODEC_ID_AMV)
+ s->flipped = 1;
+
+ return 0;
+}
+
+
+/* quantize tables */
+int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
+{
+ int len, index, i, j;
+
+ len = get_bits(&s->gb, 16) - 2;
+
+ while (len >= 65) {
+ int pr = get_bits(&s->gb, 4);
+ if (pr > 1) {
+ av_log(s->avctx, AV_LOG_ERROR, "dqt: invalid precision\n");
+ return AVERROR_INVALIDDATA;
+ }
+ index = get_bits(&s->gb, 4);
+ if (index >= 4)
+ return -1;
+ av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
+ /* read quant table */
+ for (i = 0; i < 64; i++) {
+ j = s->scantable.permutated[i];
+ s->quant_matrixes[index][j] = get_bits(&s->gb, pr ? 16 : 8);
+ }
+
+ // XXX FIXME finetune, and perhaps add dc too
+ s->qscale[index] = FFMAX(s->quant_matrixes[index][s->scantable.permutated[1]],
+ s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
+ av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
+ index, s->qscale[index]);
+ len -= 65;
+ }
+ return 0;
+}
+
+/* decode huffman tables and build VLC decoders */
+int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
+{
+ int len, index, i, class, n, v, code_max;
+ uint8_t bits_table[17];
+ uint8_t val_table[256];
+ int ret = 0;
+
+ len = get_bits(&s->gb, 16) - 2;
+
+ while (len > 0) {
+ if (len < 17)
+ return AVERROR_INVALIDDATA;
+ class = get_bits(&s->gb, 4);
+ if (class >= 2)
+ return AVERROR_INVALIDDATA;
+ index = get_bits(&s->gb, 4);
+ if (index >= 4)
+ return AVERROR_INVALIDDATA;
+ n = 0;
+ for (i = 1; i <= 16; i++) {
+ bits_table[i] = get_bits(&s->gb, 8);
+ n += bits_table[i];
+ }
+ len -= 17;
+ if (len < n || n > 256)
+ return AVERROR_INVALIDDATA;
+
+ code_max = 0;
+ for (i = 0; i < n; i++) {
+ v = get_bits(&s->gb, 8);
+ if (v > code_max)
+ code_max = v;
+ val_table[i] = v;
+ }
+ len -= n;
+
+ /* build VLC and flush previous vlc if present */
+ ff_free_vlc(&s->vlcs[class][index]);
+ av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
+ class, index, code_max + 1);
+ if ((ret = build_vlc(&s->vlcs[class][index], bits_table, val_table,
+ code_max + 1, 0, class > 0)) < 0)
+ return ret;
+
+ if (class > 0) {
+ ff_free_vlc(&s->vlcs[2][index]);
+ if ((ret = build_vlc(&s->vlcs[2][index], bits_table, val_table,
+ code_max + 1, 0, 0)) < 0)
+ return ret;
+ }
+ }
+ return 0;
+}
+
+int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
+{
+ int len, nb_components, i, width, height, pix_fmt_id;
+ int h_count[MAX_COMPONENTS];
+ int v_count[MAX_COMPONENTS];
+
+ s->cur_scan = 0;
+ s->upscale_h = s->upscale_v = 0;
+
+ /* XXX: verify len field validity */
+ len = get_bits(&s->gb, 16);
+ s->bits = get_bits(&s->gb, 8);
+
+ if (s->pegasus_rct)
+ s->bits = 9;
+ if (s->bits == 9 && !s->pegasus_rct)
+ s->rct = 1; // FIXME ugly
+
+ if (s->bits != 8 && !s->lossless) {
+ av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
+ return -1;
+ }
+
+ if(s->lossless && s->avctx->lowres){
+ av_log(s->avctx, AV_LOG_ERROR, "lowres is not possible with lossless jpeg\n");
+ return -1;
+ }
+
+ height = get_bits(&s->gb, 16);
+ width = get_bits(&s->gb, 16);
+
+ // HACK for odd_height.mov
+ if (s->interlaced && s->width == width && s->height == height + 1)
+ height= s->height;
+
+ av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
+ if (av_image_check_size(width, height, 0, s->avctx))
+ return AVERROR_INVALIDDATA;
+
+ nb_components = get_bits(&s->gb, 8);
+ if (nb_components <= 0 ||
+ nb_components > MAX_COMPONENTS)
+ return -1;
+ if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
+ if (nb_components != s->nb_components) {
+ av_log(s->avctx, AV_LOG_ERROR, "nb_components changing in interlaced picture\n");
+ return AVERROR_INVALIDDATA;
+ }
+ }
+ if (s->ls && !(s->bits <= 8 || nb_components == 1)) {
+ avpriv_report_missing_feature(s->avctx,
+ "JPEG-LS that is not <= 8 "
+ "bits/component or 16-bit gray");
+ return AVERROR_PATCHWELCOME;
+ }
+ s->nb_components = nb_components;
+ s->h_max = 1;
+ s->v_max = 1;
+ memset(h_count, 0, sizeof(h_count));
+ memset(v_count, 0, sizeof(v_count));
+ for (i = 0; i < nb_components; i++) {
+ /* component id */
+ s->component_id[i] = get_bits(&s->gb, 8) - 1;
+ h_count[i] = get_bits(&s->gb, 4);
+ v_count[i] = get_bits(&s->gb, 4);
+ /* compute hmax and vmax (only used in interleaved case) */
+ if (h_count[i] > s->h_max)
+ s->h_max = h_count[i];
+ if (v_count[i] > s->v_max)
+ s->v_max = v_count[i];
+ if (!h_count[i] || !v_count[i]) {
+ av_log(s->avctx, AV_LOG_ERROR, "h/v_count is 0\n");
+ return -1;
+ }
+ s->quant_index[i] = get_bits(&s->gb, 8);
+ if (s->quant_index[i] >= 4) {
+ av_log(s->avctx, AV_LOG_ERROR, "quant_index is invalid\n");
+ return AVERROR_INVALIDDATA;
+ }
+ av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
+ i, h_count[i], v_count[i],
+ s->component_id[i], s->quant_index[i]);
+ }
+
+ if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
+ avpriv_report_missing_feature(s->avctx, "Subsampling in JPEG-LS");
+ return AVERROR_PATCHWELCOME;
+ }
+
+
+ /* if different size, realloc/alloc picture */
+ if ( width != s->width || height != s->height
+ || memcmp(s->h_count, h_count, sizeof(h_count))
+ || memcmp(s->v_count, v_count, sizeof(v_count))) {
+
+ s->width = width;
+ s->height = height;
+ memcpy(s->h_count, h_count, sizeof(h_count));
+ memcpy(s->v_count, v_count, sizeof(v_count));
+ s->interlaced = 0;
+ s->got_picture = 0;
+
+ /* test interlaced mode */
+ if (s->first_picture &&
+ s->org_height != 0 &&
+ s->height < ((s->org_height * 3) / 4)) {
+ s->interlaced = 1;
+ s->bottom_field = s->interlace_polarity;
+ s->picture_ptr->interlaced_frame = 1;
+ s->picture_ptr->top_field_first = !s->interlace_polarity;
+ height *= 2;
+ }
+
+ avcodec_set_dimensions(s->avctx, width, height);
+
+ s->first_picture = 0;
+ }
+
+ if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
+ if (s->progressive) {
+ avpriv_request_sample(s->avctx, "progressively coded interlaced picture");
+ return AVERROR_INVALIDDATA;
+ }
+ } else{
+ if (s->v_max == 1 && s->h_max == 1 && s->lossless==1 && nb_components==3)
+ s->rgb = 1;
+ else if (!s->lossless)
+ s->rgb = 0;
+ /* XXX: not complete test ! */
+ pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
+ (s->h_count[1] << 20) | (s->v_count[1] << 16) |
+ (s->h_count[2] << 12) | (s->v_count[2] << 8) |
+ (s->h_count[3] << 4) | s->v_count[3];
+ av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
+ /* NOTE we do not allocate pictures large enough for the possible
+ * padding of h/v_count being 4 */
+ if (!(pix_fmt_id & 0xD0D0D0D0))
+ pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
+ if (!(pix_fmt_id & 0x0D0D0D0D))
+ pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
+
+ switch (pix_fmt_id) {
+ case 0x11111100:
+ if (s->rgb)
+ s->avctx->pix_fmt = AV_PIX_FMT_BGR24;
+ else {
+ if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
+ s->avctx->pix_fmt = AV_PIX_FMT_GBR24P;
+ } else {
+ s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
+ s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
+ }
+ }
+ av_assert0(s->nb_components == 3);
+ break;
+ case 0x12121100:
+ case 0x22122100:
+ s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
+ s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
+ s->upscale_v = 2;
+ s->upscale_h = (pix_fmt_id == 0x22122100);
+ s->chroma_height = s->height;
+ break;
+ case 0x21211100:
+ case 0x22211200:
+ s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
+ s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
+ s->upscale_v = (pix_fmt_id == 0x22211200);
+ s->upscale_h = 2;
+ s->chroma_height = s->height;
+ break;
+ case 0x22221100:
+ s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
+ s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
+ s->upscale_v = 2;
+ s->upscale_h = 2;
+ s->chroma_height = s->height / 2;
+ break;
+ case 0x11000000:
+ case 0x13000000:
+ case 0x14000000:
+ case 0x31000000:
+ case 0x33000000:
+ case 0x34000000:
+ case 0x41000000:
+ case 0x43000000:
+ case 0x44000000:
+ if(s->bits <= 8)
+ s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
+ else
+ s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
+ break;
+ case 0x12111100:
+ case 0x22211100:
+ case 0x22112100:
+ s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV440P : AV_PIX_FMT_YUVJ440P;
+ s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
+ s->upscale_h = (pix_fmt_id == 0x22211100) * 2 + (pix_fmt_id == 0x22112100);
+ s->chroma_height = s->height / 2;
+ break;
+ case 0x21111100:
+ s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
+ s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
+ break;
+ case 0x22121100:
+ case 0x22111200:
+ s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
+ s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
+ s->upscale_v = (pix_fmt_id == 0x22121100) + 1;
+ break;
+ case 0x22111100:
+ s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV420P : AV_PIX_FMT_YUVJ420P;
+ s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
+ break;
+ default:
+ av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
+ return AVERROR_PATCHWELCOME;
+ }
+ if ((s->upscale_h || s->upscale_v) && s->avctx->lowres) {
+ av_log(s->avctx, AV_LOG_ERROR, "lowres not supported for weird subsampling\n");
+ return AVERROR_PATCHWELCOME;
+ }
+ if (s->ls) {
+ s->upscale_h = s->upscale_v = 0;
+ if (s->nb_components > 1)
+ s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
+ else if (s->bits <= 8)
+ s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
+ else
+ s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
+ }
+
+ av_frame_unref(s->picture_ptr);
+ if (ff_get_buffer(s->avctx, s->picture_ptr, AV_GET_BUFFER_FLAG_REF) < 0)
+ return -1;
+ s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
+ s->picture_ptr->key_frame = 1;
+ s->got_picture = 1;
+
+ for (i = 0; i < 3; i++)
+ s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
+
+ av_dlog(s->avctx, "%d %d %d %d %d %d\n",
+ s->width, s->height, s->linesize[0], s->linesize[1],
+ s->interlaced, s->avctx->height);
+
+ if (len != (8 + (3 * nb_components)))
+ av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
+ }
+
+ if (s->rgb && !s->lossless && !s->ls) {
+ av_log(s->avctx, AV_LOG_ERROR, "Unsupported coding and pixel format combination\n");
+ return AVERROR_PATCHWELCOME;
+ }
+
+ /* totally blank picture as progressive JPEG will only add details to it */
+ if (s->progressive) {
+ int bw = (width + s->h_max * 8 - 1) / (s->h_max * 8);
+ int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
+ for (i = 0; i < s->nb_components; i++) {
+ int size = bw * bh * s->h_count[i] * s->v_count[i];
+ av_freep(&s->blocks[i]);
+ av_freep(&s->last_nnz[i]);
+ s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
+ s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
+ s->block_stride[i] = bw * s->h_count[i];
+ }
+ memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
+ }
+ return 0;
+}
+
+static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
+{
+ int code;
+ code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
+ if (code < 0) {
+ av_log(s->avctx, AV_LOG_WARNING,
+ "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
+ 0, dc_index, &s->vlcs[0][dc_index]);
+ return 0xffff;
+ }
+
+ if (code)
+ return get_xbits(&s->gb, code);
+ else
+ return 0;
+}
+
+/* decode block and dequantize */
+static int decode_block(MJpegDecodeContext *s, int16_t *block, int component,
+ int dc_index, int ac_index, int16_t *quant_matrix)
+{
+ int code, i, j, level, val;
+
+ /* DC coef */
+ val = mjpeg_decode_dc(s, dc_index);
+ if (val == 0xffff) {
+ av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
+ return AVERROR_INVALIDDATA;
+ }
+ val = val * quant_matrix[0] + s->last_dc[component];
+ s->last_dc[component] = val;
+ block[0] = val;
+ /* AC coefs */
+ i = 0;
+ {OPEN_READER(re, &s->gb);
+ do {
+ UPDATE_CACHE(re, &s->gb);
+ GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
+
+ i += ((unsigned)code) >> 4;
+ code &= 0xf;
+ if (code) {
+ if (code > MIN_CACHE_BITS - 16)
+ UPDATE_CACHE(re, &s->gb);
+
+ {
+ int cache = GET_CACHE(re, &s->gb);
+ int sign = (~cache) >> 31;
+ level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
+ }
+
+ LAST_SKIP_BITS(re, &s->gb, code);
+
+ if (i > 63) {
+ av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
+ return AVERROR_INVALIDDATA;
+ }
+ j = s->scantable.permutated[i];
+ block[j] = level * quant_matrix[j];
+ }
+ } while (i < 63);
+ CLOSE_READER(re, &s->gb);}
+
+ return 0;
+}
+
+static int decode_dc_progressive(MJpegDecodeContext *s, int16_t *block,
+ int component, int dc_index,
+ int16_t *quant_matrix, int Al)
+{
+ int val;
+ s->dsp.clear_block(block);
+ val = mjpeg_decode_dc(s, dc_index);
+ if (val == 0xffff) {
+ av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
+ return AVERROR_INVALIDDATA;
+ }
+ val = (val * quant_matrix[0] << Al) + s->last_dc[component];
+ s->last_dc[component] = val;
+ block[0] = val;
+ return 0;
+}
+
+/* decode block and dequantize - progressive JPEG version */
+static int decode_block_progressive(MJpegDecodeContext *s, int16_t *block,
+ uint8_t *last_nnz, int ac_index,
+ int16_t *quant_matrix,
+ int ss, int se, int Al, int *EOBRUN)
+{
+ int code, i, j, level, val, run;
+
+ if (*EOBRUN) {
+ (*EOBRUN)--;
+ return 0;
+ }
+
+ {
+ OPEN_READER(re, &s->gb);
+ for (i = ss; ; i++) {
+ UPDATE_CACHE(re, &s->gb);
+ GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
+
+ run = ((unsigned) code) >> 4;
+ code &= 0xF;
+ if (code) {
+ i += run;
+ if (code > MIN_CACHE_BITS - 16)
+ UPDATE_CACHE(re, &s->gb);
+
+ {
+ int cache = GET_CACHE(re, &s->gb);
+ int sign = (~cache) >> 31;
+ level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
+ }
+
+ LAST_SKIP_BITS(re, &s->gb, code);
+
+ if (i >= se) {
+ if (i == se) {
+ j = s->scantable.permutated[se];
+ block[j] = level * quant_matrix[j] << Al;
+ break;
+ }
+ av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
+ return AVERROR_INVALIDDATA;
+ }
+ j = s->scantable.permutated[i];
+ block[j] = level * quant_matrix[j] << Al;
+ } else {
+ if (run == 0xF) {// ZRL - skip 15 coefficients
+ i += 15;
+ if (i >= se) {
+ av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
+ return AVERROR_INVALIDDATA;
+ }
+ } else {
+ val = (1 << run);
+ if (run) {
+ UPDATE_CACHE(re, &s->gb);
+ val += NEG_USR32(GET_CACHE(re, &s->gb), run);
+ LAST_SKIP_BITS(re, &s->gb, run);
+ }
+ *EOBRUN = val - 1;
+ break;
+ }
+ }
+ }
+ CLOSE_READER(re, &s->gb);
+ }
+
+ if (i > *last_nnz)
+ *last_nnz = i;
+
+ return 0;
+}
+
+#define REFINE_BIT(j) { \
+ UPDATE_CACHE(re, &s->gb); \
+ sign = block[j] >> 15; \
+ block[j] += SHOW_UBITS(re, &s->gb, 1) * \
+ ((quant_matrix[j] ^ sign) - sign) << Al; \
+ LAST_SKIP_BITS(re, &s->gb, 1); \
+}
+
+#define ZERO_RUN \
+for (; ; i++) { \
+ if (i > last) { \
+ i += run; \
+ if (i > se) { \
+ av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
+ return -1; \
+ } \
+ break; \
+ } \
+ j = s->scantable.permutated[i]; \
+ if (block[j]) \
+ REFINE_BIT(j) \
+ else if (run-- == 0) \
+ break; \
+}
+
+/* decode block and dequantize - progressive JPEG refinement pass */
+static int decode_block_refinement(MJpegDecodeContext *s, int16_t *block,
+ uint8_t *last_nnz,
+ int ac_index, int16_t *quant_matrix,
+ int ss, int se, int Al, int *EOBRUN)
+{
+ int code, i = ss, j, sign, val, run;
+ int last = FFMIN(se, *last_nnz);
+
+ OPEN_READER(re, &s->gb);
+ if (*EOBRUN) {
+ (*EOBRUN)--;
+ } else {
+ for (; ; i++) {
+ UPDATE_CACHE(re, &s->gb);
+ GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
+
+ if (code & 0xF) {
+ run = ((unsigned) code) >> 4;
+ UPDATE_CACHE(re, &s->gb);
+ val = SHOW_UBITS(re, &s->gb, 1);
+ LAST_SKIP_BITS(re, &s->gb, 1);
+ ZERO_RUN;
+ j = s->scantable.permutated[i];
+ val--;
+ block[j] = ((quant_matrix[j]^val) - val) << Al;
+ if (i == se) {
+ if (i > *last_nnz)
+ *last_nnz = i;
+ CLOSE_READER(re, &s->gb);
+ return 0;
+ }
+ } else {
+ run = ((unsigned) code) >> 4;
+ if (run == 0xF) {
+ ZERO_RUN;
+ } else {
+ val = run;
+ run = (1 << run);
+ if (val) {
+ UPDATE_CACHE(re, &s->gb);
+ run += SHOW_UBITS(re, &s->gb, val);
+ LAST_SKIP_BITS(re, &s->gb, val);
+ }
+ *EOBRUN = run - 1;
+ break;
+ }
+ }
+ }
+
+ if (i > *last_nnz)
+ *last_nnz = i;
+ }
+
+ for (; i <= last; i++) {
+ j = s->scantable.permutated[i];
+ if (block[j])
+ REFINE_BIT(j)
+ }
+ CLOSE_READER(re, &s->gb);
+
+ return 0;
+}
+#undef REFINE_BIT
+#undef ZERO_RUN
+
+static void handle_rstn(MJpegDecodeContext *s, int nb_components)
+{
+ int i;
+ if (s->restart_interval) {
+ s->restart_count--;
+ if(s->restart_count == 0 && s->avctx->codec_id == AV_CODEC_ID_THP){
+ align_get_bits(&s->gb);
+ for (i = 0; i < nb_components; i++) /* reset dc */
+ s->last_dc[i] = 1024;
+ }
+
+ i = 8 + ((-get_bits_count(&s->gb)) & 7);
+ /* skip RSTn */
+ if (s->restart_count == 0) {
+ if( show_bits(&s->gb, i) == (1 << i) - 1
+ || show_bits(&s->gb, i) == 0xFF) {
+ int pos = get_bits_count(&s->gb);
+ align_get_bits(&s->gb);
+ while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
+ skip_bits(&s->gb, 8);
+ if (get_bits_left(&s->gb) >= 8 && (get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
+ for (i = 0; i < nb_components; i++) /* reset dc */
+ s->last_dc[i] = 1024;
+ } else
+ skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
+ }
+ }
+ }
+}
+
+static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int predictor, int point_transform)
+{
+ int i, mb_x, mb_y;
+ uint16_t (*buffer)[4];
+ int left[3], top[3], topleft[3];
+ const int linesize = s->linesize[0];
+ const int mask = (1 << s->bits) - 1;
+ int resync_mb_y = 0;
+ int resync_mb_x = 0;
+
+ s->restart_count = s->restart_interval;
+
+ av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
+ (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
+ buffer = s->ljpeg_buffer;
+
+ for (i = 0; i < 3; i++)
+ buffer[0][i] = 1 << (s->bits - 1);
+
+ for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
+ uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
+
+ if (s->interlaced && s->bottom_field)
+ ptr += linesize >> 1;
+
+ for (i = 0; i < 3; i++)
+ top[i] = left[i] = topleft[i] = buffer[0][i];
+
+ for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
+ int modified_predictor = predictor;
+
+ if (s->restart_interval && !s->restart_count){
+ s->restart_count = s->restart_interval;
+ resync_mb_x = mb_x;
+ resync_mb_y = mb_y;
+ for(i=0; i<3; i++)
+ top[i] = left[i]= topleft[i]= 1 << (s->bits - 1);
+ }
+ if (mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || !mb_x)
+ modified_predictor = 1;
+
+ for (i=0;i<nb_components;i++) {
+ int pred, dc;
+
+ topleft[i] = top[i];
+ top[i] = buffer[mb_x][i];
+
+ PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
+
+ dc = mjpeg_decode_dc(s, s->dc_index[i]);
+ if(dc == 0xFFFF)
+ return -1;
+
+ left[i] = buffer[mb_x][i] =
+ mask & (pred + (dc << point_transform));
+ }
+
+ if (s->restart_interval && !--s->restart_count) {
+ align_get_bits(&s->gb);
+ skip_bits(&s->gb, 16); /* skip RSTn */
+ }
+ }
+
+ if (s->rct) {
+ for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
+ ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
+ ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
+ ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
+ }
+ } else if (s->pegasus_rct) {
+ for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
+ ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
+ ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
+ ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
+ }
+ } else {
+ for(i=0; i<nb_components; i++) {
+ int c= s->comp_index[i];
+ for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
+ ptr[3*mb_x+2-c] = buffer[mb_x][i];
+ }
+ }
+ }
+ }
+ return 0;
+}
+
+static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int nb_components, int predictor,
+ int point_transform)
+{
+ int i, mb_x, mb_y;
+ int bits= (s->bits+7)&~7;
+ int resync_mb_y = 0;
+ int resync_mb_x = 0;
+
+ point_transform += bits - s->bits;
+
+ av_assert0(nb_components>=1 && nb_components<=3);
+
+ for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
+ for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
+ if (s->restart_interval && !s->restart_count){
+ s->restart_count = s->restart_interval;
+ resync_mb_x = mb_x;
+ resync_mb_y = mb_y;
+ }
+
+ if(!mb_x || mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || s->interlaced){
+ int toprow = mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x;
+ int leftcol = !mb_x || mb_y == resync_mb_y && mb_x == resync_mb_x;
+ for (i = 0; i < nb_components; i++) {
+ uint8_t *ptr;
+ uint16_t *ptr16;
+ int n, h, v, x, y, c, j, linesize;
+ n = s->nb_blocks[i];
+ c = s->comp_index[i];
+ h = s->h_scount[i];
+ v = s->v_scount[i];
+ x = 0;
+ y = 0;
+ linesize= s->linesize[c];
+
+ if(bits>8) linesize /= 2;
+
+ for(j=0; j<n; j++) {
+ int pred, dc;
+
+ dc = mjpeg_decode_dc(s, s->dc_index[i]);
+ if(dc == 0xFFFF)
+ return -1;
+ if(bits<=8){
+ ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
+ if(y==0 && toprow){
+ if(x==0 && leftcol){
+ pred= 1 << (bits - 1);
+ }else{
+ pred= ptr[-1];
+ }
+ }else{
+ if(x==0 && leftcol){
+ pred= ptr[-linesize];
+ }else{
+ PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
+ }
+ }
+
+ if (s->interlaced && s->bottom_field)
+ ptr += linesize >> 1;
+ pred &= (-1)<<(8-s->bits);
+ *ptr= pred + (dc << point_transform);
+ }else{
+ ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
+ if(y==0 && toprow){
+ if(x==0 && leftcol){
+ pred= 1 << (bits - 1);
+ }else{
+ pred= ptr16[-1];
+ }
+ }else{
+ if(x==0 && leftcol){
+ pred= ptr16[-linesize];
+ }else{
+ PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
+ }
+ }
+
+ if (s->interlaced && s->bottom_field)
+ ptr16 += linesize >> 1;
+ pred &= (-1)<<(16-s->bits);
+ *ptr16= pred + (dc << point_transform);
+ }
+ if (++x == h) {
+ x = 0;
+ y++;
+ }
+ }
+ }
+ } else {
+ for (i = 0; i < nb_components; i++) {
+ uint8_t *ptr;
+ uint16_t *ptr16;
+ int n, h, v, x, y, c, j, linesize, dc;
+ n = s->nb_blocks[i];
+ c = s->comp_index[i];
+ h = s->h_scount[i];
+ v = s->v_scount[i];
+ x = 0;
+ y = 0;
+ linesize = s->linesize[c];
+
+ if(bits>8) linesize /= 2;
+
+ for (j = 0; j < n; j++) {
+ int pred;
+
+ dc = mjpeg_decode_dc(s, s->dc_index[i]);
+ if(dc == 0xFFFF)
+ return -1;
+ if(bits<=8){
+ ptr = s->picture.data[c] +
+ (linesize * (v * mb_y + y)) +
+ (h * mb_x + x); //FIXME optimize this crap
+ PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
+
+ pred &= (-1)<<(8-s->bits);
+ *ptr = pred + (dc << point_transform);
+ }else{
+ ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
+ PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
+
+ pred &= (-1)<<(16-s->bits);
+ *ptr16= pred + (dc << point_transform);
+ }
+
+ if (++x == h) {
+ x = 0;
+ y++;
+ }
+ }
+ }
+ }
+ if (s->restart_interval && !--s->restart_count) {
+ align_get_bits(&s->gb);
+ skip_bits(&s->gb, 16); /* skip RSTn */
+ }
+ }
+ }
+ return 0;
+}
+
+static av_always_inline void mjpeg_copy_block(MJpegDecodeContext *s,
+ uint8_t *dst, const uint8_t *src,
+ int linesize, int lowres)
+{
+ switch (lowres) {
+ case 0: s->hdsp.put_pixels_tab[1][0](dst, src, linesize, 8);
+ break;
+ case 1: copy_block4(dst, src, linesize, linesize, 4);
+ break;
+ case 2: copy_block2(dst, src, linesize, linesize, 2);
+ break;
+ case 3: *dst = *src;
+ break;
+ }
+}
+
+static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
+ int Al, const uint8_t *mb_bitmask,
+ const AVFrame *reference)
+{
+ int i, mb_x, mb_y;
+ uint8_t *data[MAX_COMPONENTS];
+ const uint8_t *reference_data[MAX_COMPONENTS];
+ int linesize[MAX_COMPONENTS];
+ GetBitContext mb_bitmask_gb;
+
+ if (mb_bitmask)
+ init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
+
+ if (s->flipped && s->avctx->lowres) {
+ av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with lowres\n");
+ s->flipped = 0;
+ }
+
+ for (i = 0; i < nb_components; i++) {
+ int c = s->comp_index[i];
+ data[c] = s->picture_ptr->data[c];
+ reference_data[c] = reference ? reference->data[c] : NULL;
+ linesize[c] = s->linesize[c];
+ s->coefs_finished[c] |= 1;
+ if (s->flipped && !(s->avctx->flags & CODEC_FLAG_EMU_EDGE)) {
+ // picture should be flipped upside-down for this codec
+ int offset = (linesize[c] * (s->v_scount[i] *
+ (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
+ data[c] += offset;
+ reference_data[c] += offset;
+ linesize[c] *= -1;
+ }
+ }
+
+ for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
+ for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
+ const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
+
+ if (s->restart_interval && !s->restart_count)
+ s->restart_count = s->restart_interval;
+
+ if (get_bits_left(&s->gb) < 0) {
+ av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
+ -get_bits_left(&s->gb));
+ return AVERROR_INVALIDDATA;
+ }
+ for (i = 0; i < nb_components; i++) {
+ uint8_t *ptr;
+ int n, h, v, x, y, c, j;
+ int block_offset;
+ n = s->nb_blocks[i];
+ c = s->comp_index[i];
+ h = s->h_scount[i];
+ v = s->v_scount[i];
+ x = 0;
+ y = 0;
+ for (j = 0; j < n; j++) {
+ block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
+ (h * mb_x + x) * 8) >> s->avctx->lowres);
+
+ if (s->interlaced && s->bottom_field)
+ block_offset += linesize[c] >> 1;
+ ptr = data[c] + block_offset;
+ if (!s->progressive) {
+ if (copy_mb)
+ mjpeg_copy_block(s, ptr, reference_data[c] + block_offset,
+ linesize[c], s->avctx->lowres);
+
+ else {
+ s->dsp.clear_block(s->block);
+ if (decode_block(s, s->block, i,
+ s->dc_index[i], s->ac_index[i],
+ s->quant_matrixes[s->quant_index[c]]) < 0) {
+ av_log(s->avctx, AV_LOG_ERROR,
+ "error y=%d x=%d\n", mb_y, mb_x);
+ return AVERROR_INVALIDDATA;
+ }
+ s->dsp.idct_put(ptr, linesize[c], s->block);
+ }
+ } else {
+ int block_idx = s->block_stride[c] * (v * mb_y + y) +
+ (h * mb_x + x);
+ int16_t *block = s->blocks[c][block_idx];
+ if (Ah)
+ block[0] += get_bits1(&s->gb) *
+ s->quant_matrixes[s->quant_index[c]][0] << Al;
+ else if (decode_dc_progressive(s, block, i, s->dc_index[i],
+ s->quant_matrixes[s->quant_index[c]],
+ Al) < 0) {
+ av_log(s->avctx, AV_LOG_ERROR,
+ "error y=%d x=%d\n", mb_y, mb_x);
+ return AVERROR_INVALIDDATA;
+ }
+ }
+ av_dlog(s->avctx, "mb: %d %d processed\n", mb_y, mb_x);
+ av_dlog(s->avctx, "%d %d %d %d %d %d %d %d \n",
+ mb_x, mb_y, x, y, c, s->bottom_field,
+ (v * mb_y + y) * 8, (h * mb_x + x) * 8);
+ if (++x == h) {
+ x = 0;
+ y++;
+ }
+ }
+ }
+
+ handle_rstn(s, nb_components);
+ }
+ }
+ return 0;
+}
+
+static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
+ int se, int Ah, int Al)
+{
+ int mb_x, mb_y;
+ int EOBRUN = 0;
+ int c = s->comp_index[0];
+ uint8_t *data = s->picture.data[c];
+ int linesize = s->linesize[c];
+ int last_scan = 0;
+ int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
+
+ if (se > 63) {
+ av_log(s->avctx, AV_LOG_ERROR, "SE %d is too large\n", se);
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (!Al) {
+ s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
+ last_scan = !~s->coefs_finished[c];
+ }
+
+ if (s->interlaced && s->bottom_field)
+ data += linesize >> 1;
+
+ s->restart_count = 0;
+
+ for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
+ uint8_t *ptr = data + (mb_y * linesize * 8 >> s->avctx->lowres);
+ int block_idx = mb_y * s->block_stride[c];
+ int16_t (*block)[64] = &s->blocks[c][block_idx];
+ uint8_t *last_nnz = &s->last_nnz[c][block_idx];
+ for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
+ int ret;
+ if (s->restart_interval && !s->restart_count)
+ s->restart_count = s->restart_interval;
+
+ if (Ah)
+ ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
+ quant_matrix, ss, se, Al, &EOBRUN);
+ else
+ ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
+ quant_matrix, ss, se, Al, &EOBRUN);
+ if (ret < 0) {
+ av_log(s->avctx, AV_LOG_ERROR,
+ "error y=%d x=%d\n", mb_y, mb_x);
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (last_scan) {
+ s->dsp.idct_put(ptr, linesize, *block);
+ ptr += 8 >> s->avctx->lowres;
+ }
+ handle_rstn(s, 0);
+ }
+ }
+ return 0;
+}
+
+int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
+ const AVFrame *reference)
+{
+ int len, nb_components, i, h, v, predictor, point_transform;
+ int index, id, ret;
+ const int block_size = s->lossless ? 1 : 8;
+ int ilv, prev_shift;
+
+ if (!s->got_picture) {
+ av_log(s->avctx, AV_LOG_WARNING,
+ "Can not process SOS before SOF, skipping\n");
+ return -1;
+ }
+
+ av_assert0(s->picture_ptr->data[0]);
+ /* XXX: verify len field validity */
+ len = get_bits(&s->gb, 16);
+ nb_components = get_bits(&s->gb, 8);
+ if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
+ av_log(s->avctx, AV_LOG_ERROR,
+ "decode_sos: nb_components (%d) unsupported\n", nb_components);
+ return AVERROR_PATCHWELCOME;
+ }
+ if (len != 6 + 2 * nb_components) {
+ av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
+ return AVERROR_INVALIDDATA;
+ }
+ for (i = 0; i < nb_components; i++) {
+ id = get_bits(&s->gb, 8) - 1;
+ av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
+ /* find component index */
+ for (index = 0; index < s->nb_components; index++)
+ if (id == s->component_id[index])
+ break;
+ if (index == s->nb_components) {
+ av_log(s->avctx, AV_LOG_ERROR,
+ "decode_sos: index(%d) out of components\n", index);
+ return AVERROR_INVALIDDATA;
+ }
+ /* Metasoft MJPEG codec has Cb and Cr swapped */
+ if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
+ && nb_components == 3 && s->nb_components == 3 && i)
+ index = 3 - i;
+
+ if(nb_components == 3 && s->nb_components == 3 && s->avctx->pix_fmt == AV_PIX_FMT_GBR24P)
+ index = (i+2)%3;
+ if(nb_components == 1 && s->nb_components == 3 && s->avctx->pix_fmt == AV_PIX_FMT_GBR24P)
+ index = (index+2)%3;
+
+ s->comp_index[i] = index;
+
+ s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
+ s->h_scount[i] = s->h_count[index];
+ s->v_scount[i] = s->v_count[index];
+
+ s->dc_index[i] = get_bits(&s->gb, 4);
+ s->ac_index[i] = get_bits(&s->gb, 4);
+
+ if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
+ s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
+ goto out_of_range;
+ if (!s->vlcs[0][s->dc_index[i]].table || !(s->progressive ? s->vlcs[2][s->ac_index[0]].table : s->vlcs[1][s->ac_index[i]].table))
+ goto out_of_range;
+ }
+
+ predictor = get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
+ ilv = get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
+ if(s->avctx->codec_tag != AV_RL32("CJPG")){
+ prev_shift = get_bits(&s->gb, 4); /* Ah */
+ point_transform = get_bits(&s->gb, 4); /* Al */
+ }else
+ prev_shift = point_transform = 0;
+
+ if (nb_components > 1) {
+ /* interleaved stream */
+ s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
+ s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
+ } else if (!s->ls) { /* skip this for JPEG-LS */
+ h = s->h_max / s->h_scount[0];
+ v = s->v_max / s->v_scount[0];
+ s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
+ s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
+ s->nb_blocks[0] = 1;
+ s->h_scount[0] = 1;
+ s->v_scount[0] = 1;
+ }
+
+ if (s->avctx->debug & FF_DEBUG_PICT_INFO)
+ av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s comp:%d\n",
+ s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
+ predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
+ s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""), nb_components);
+
+
+ /* mjpeg-b can have padding bytes between sos and image data, skip them */
+ for (i = s->mjpb_skiptosod; i > 0; i--)
+ skip_bits(&s->gb, 8);
+
+next_field:
+ for (i = 0; i < nb_components; i++)
+ s->last_dc[i] = 1024;
+
+ if (s->lossless) {
+ av_assert0(s->picture_ptr == &s->picture);
+ if (CONFIG_JPEGLS_DECODER && s->ls) {
+// for () {
+// reset_ls_coding_parameters(s, 0);
+
+ if ((ret = ff_jpegls_decode_picture(s, predictor,
+ point_transform, ilv)) < 0)
+ return ret;
+ } else {
+ if (s->rgb) {
+ if ((ret = ljpeg_decode_rgb_scan(s, nb_components, predictor, point_transform)) < 0)
+ return ret;
+ } else {
+ if ((ret = ljpeg_decode_yuv_scan(s, nb_components, predictor, point_transform)) < 0)
+ return ret;
+ }
+ }
+ } else {
+ if (s->progressive && predictor) {
+ av_assert0(s->picture_ptr == &s->picture);
+ if ((ret = mjpeg_decode_scan_progressive_ac(s, predictor,
+ ilv, prev_shift,
+ point_transform)) < 0)
+ return ret;
+ } else {
+ if ((ret = mjpeg_decode_scan(s, nb_components,
+ prev_shift, point_transform,
+ mb_bitmask, reference)) < 0)
+ return ret;
+ }
+ }
+
+ if (s->interlaced &&
+ get_bits_left(&s->gb) > 32 &&
+ show_bits(&s->gb, 8) == 0xFF) {
+ GetBitContext bak = s->gb;
+ align_get_bits(&bak);
+ if (show_bits(&bak, 16) == 0xFFD1) {
+ av_log(s->avctx, AV_LOG_DEBUG, "AVRn interlaced picture marker found\n");
+ s->gb = bak;
+ skip_bits(&s->gb, 16);
+ s->bottom_field ^= 1;
+
+ goto next_field;
+ }
+ }
+
+ emms_c();
+ return 0;
+ out_of_range:
+ av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
+ return AVERROR_INVALIDDATA;
+}
+
+static int mjpeg_decode_dri(MJpegDecodeContext *s)
+{
+ if (get_bits(&s->gb, 16) != 4)
+ return AVERROR_INVALIDDATA;
+ s->restart_interval = get_bits(&s->gb, 16);
+ s->restart_count = 0;
+ av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
+ s->restart_interval);
+
+ return 0;
+}
+
+static int mjpeg_decode_app(MJpegDecodeContext *s)
+{
+ int len, id, i;
+
+ len = get_bits(&s->gb, 16);
+ if (len < 5)
+ return AVERROR_INVALIDDATA;
+ if (8 * len > get_bits_left(&s->gb))
+ return AVERROR_INVALIDDATA;
+
+ id = get_bits_long(&s->gb, 32);
+ len -= 6;
+
+ if (s->avctx->debug & FF_DEBUG_STARTCODE)
+ av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
+
+ /* Buggy AVID, it puts EOI only at every 10th frame. */
+ /* Also, this fourcc is used by non-avid files too, it holds some
+ information, but it's always present in AVID-created files. */
+ if (id == AV_RB32("AVI1")) {
+ /* structure:
+ 4bytes AVI1
+ 1bytes polarity
+ 1bytes always zero
+ 4bytes field_size
+ 4bytes field_size_less_padding
+ */
+ s->buggy_avid = 1;
+ i = get_bits(&s->gb, 8); len--;
+ av_log(s->avctx, AV_LOG_DEBUG, "polarity %d\n", i);
+#if 0
+ skip_bits(&s->gb, 8);
+ skip_bits(&s->gb, 32);
+ skip_bits(&s->gb, 32);
+ len -= 10;
+#endif
+ goto out;
+ }
+
+// len -= 2;
+
+ if (id == AV_RB32("JFIF")) {
+ int t_w, t_h, v1, v2;
+ skip_bits(&s->gb, 8); /* the trailing zero-byte */
+ v1 = get_bits(&s->gb, 8);
+ v2 = get_bits(&s->gb, 8);
+ skip_bits(&s->gb, 8);
+
+ s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
+ s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
+
+ if (s->avctx->debug & FF_DEBUG_PICT_INFO)
+ av_log(s->avctx, AV_LOG_INFO,
+ "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
+ v1, v2,
+ s->avctx->sample_aspect_ratio.num,
+ s->avctx->sample_aspect_ratio.den);
+
+ t_w = get_bits(&s->gb, 8);
+ t_h = get_bits(&s->gb, 8);
+ if (t_w && t_h) {
+ /* skip thumbnail */
+ if (len -10 - (t_w * t_h * 3) > 0)
+ len -= t_w * t_h * 3;
+ }
+ len -= 10;
+ goto out;
+ }
+
+ if (id == AV_RB32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
+ if (s->avctx->debug & FF_DEBUG_PICT_INFO)
+ av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
+ skip_bits(&s->gb, 16); /* version */
+ skip_bits(&s->gb, 16); /* flags0 */
+ skip_bits(&s->gb, 16); /* flags1 */
+ skip_bits(&s->gb, 8); /* transform */
+ len -= 7;
+ goto out;
+ }
+
+ if (id == AV_RB32("LJIF")) {
+ if (s->avctx->debug & FF_DEBUG_PICT_INFO)
+ av_log(s->avctx, AV_LOG_INFO,
+ "Pegasus lossless jpeg header found\n");
+ skip_bits(&s->gb, 16); /* version ? */
+ skip_bits(&s->gb, 16); /* unknown always 0? */
+ skip_bits(&s->gb, 16); /* unknown always 0? */
+ skip_bits(&s->gb, 16); /* unknown always 0? */
+ switch (get_bits(&s->gb, 8)) {
+ case 1:
+ s->rgb = 1;
+ s->pegasus_rct = 0;
+ break;
+ case 2:
+ s->rgb = 1;
+ s->pegasus_rct = 1;
+ break;
+ default:
+ av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
+ }
+ len -= 9;
+ goto out;
+ }
+
+ /* Apple MJPEG-A */
+ if ((s->start_code == APP1) && (len > (0x28 - 8))) {
+ id = get_bits_long(&s->gb, 32);
+ len -= 4;
+ /* Apple MJPEG-A */
+ if (id == AV_RB32("mjpg")) {
+#if 0
+ skip_bits(&s->gb, 32); /* field size */
+ skip_bits(&s->gb, 32); /* pad field size */
+ skip_bits(&s->gb, 32); /* next off */
+ skip_bits(&s->gb, 32); /* quant off */
+ skip_bits(&s->gb, 32); /* huff off */
+ skip_bits(&s->gb, 32); /* image off */
+ skip_bits(&s->gb, 32); /* scan off */
+ skip_bits(&s->gb, 32); /* data off */
+#endif
+ if (s->avctx->debug & FF_DEBUG_PICT_INFO)
+ av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
+ }
+ }
+
+out:
+ /* slow but needed for extreme adobe jpegs */
+ if (len < 0)
+ av_log(s->avctx, AV_LOG_ERROR,
+ "mjpeg: error, decode_app parser read over the end\n");
+ while (--len > 0)
+ skip_bits(&s->gb, 8);
+
+ return 0;
+}
+
+static int mjpeg_decode_com(MJpegDecodeContext *s)
+{
+ int len = get_bits(&s->gb, 16);
+ if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
+ char *cbuf = av_malloc(len - 1);
+ if (cbuf) {
+ int i;
+ for (i = 0; i < len - 2; i++)
+ cbuf[i] = get_bits(&s->gb, 8);
+ if (i > 0 && cbuf[i - 1] == '\n')
+ cbuf[i - 1] = 0;
+ else
+ cbuf[i] = 0;
+
+ if (s->avctx->debug & FF_DEBUG_PICT_INFO)
+ av_log(s->avctx, AV_LOG_INFO, "comment: '%s'\n", cbuf);
+
+ /* buggy avid, it puts EOI only at every 10th frame */
+ if (!strcmp(cbuf, "AVID")) {
+ s->buggy_avid = 1;
+ } else if (!strcmp(cbuf, "CS=ITU601"))
+ s->cs_itu601 = 1;
+ else if ((len > 31 && !strncmp(cbuf, "Intel(R) JPEG Library, version 1", 32)) ||
+ (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
+ s->flipped = 1;
+
+ av_free(cbuf);
+ }
+ }
+
+ return 0;
+}
+
+/* return the 8 bit start code value and update the search
+ state. Return -1 if no start code found */
+static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
+{
+ const uint8_t *buf_ptr;
+ unsigned int v, v2;
+ int val;
+ int skipped = 0;
+
+ buf_ptr = *pbuf_ptr;
+ while (buf_ptr < buf_end) {
+ v = *buf_ptr++;
+ v2 = *buf_ptr;
+ if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
+ val = *buf_ptr++;
+ goto found;
+ }
+ skipped++;
+ }
+ val = -1;
+found:
+ av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
+ *pbuf_ptr = buf_ptr;
+ return val;
+}
+
+int ff_mjpeg_find_marker(MJpegDecodeContext *s,
+ const uint8_t **buf_ptr, const uint8_t *buf_end,
+ const uint8_t **unescaped_buf_ptr,
+ int *unescaped_buf_size)
+{
+ int start_code;
+ start_code = find_marker(buf_ptr, buf_end);
+
+ av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
+ if (!s->buffer)
+ return AVERROR(ENOMEM);
+
+ /* unescape buffer of SOS, use special treatment for JPEG-LS */
+ if (start_code == SOS && !s->ls) {
+ const uint8_t *src = *buf_ptr;
+ uint8_t *dst = s->buffer;
+
+ while (src < buf_end) {
+ uint8_t x = *(src++);
+
+ *(dst++) = x;
+ if (s->avctx->codec_id != AV_CODEC_ID_THP) {
+ if (x == 0xff) {
+ while (src < buf_end && x == 0xff)
+ x = *(src++);
+
+ if (x >= 0xd0 && x <= 0xd7)
+ *(dst++) = x;
+ else if (x)
+ break;
+ }
+ }
+ }
+ *unescaped_buf_ptr = s->buffer;
+ *unescaped_buf_size = dst - s->buffer;
+ memset(s->buffer + *unescaped_buf_size, 0,
+ FF_INPUT_BUFFER_PADDING_SIZE);
+
+ av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
+ (buf_end - *buf_ptr) - (dst - s->buffer));
+ } else if (start_code == SOS && s->ls) {
+ const uint8_t *src = *buf_ptr;
+ uint8_t *dst = s->buffer;
+ int bit_count = 0;
+ int t = 0, b = 0;
+ PutBitContext pb;
+
+ s->cur_scan++;
+
+ /* find marker */
+ while (src + t < buf_end) {
+ uint8_t x = src[t++];
+ if (x == 0xff) {
+ while ((src + t < buf_end) && x == 0xff)
+ x = src[t++];
+ if (x & 0x80) {
+ t -= FFMIN(2, t);
+ break;
+ }
+ }
+ }
+ bit_count = t * 8;
+ init_put_bits(&pb, dst, t);
+
+ /* unescape bitstream */
+ while (b < t) {
+ uint8_t x = src[b++];
+ put_bits(&pb, 8, x);
+ if (x == 0xFF) {
+ x = src[b++];
+ put_bits(&pb, 7, x);
+ bit_count--;
+ }
+ }
+ flush_put_bits(&pb);
+
+ *unescaped_buf_ptr = dst;
+ *unescaped_buf_size = (bit_count + 7) >> 3;
+ memset(s->buffer + *unescaped_buf_size, 0,
+ FF_INPUT_BUFFER_PADDING_SIZE);
+ } else {
+ *unescaped_buf_ptr = *buf_ptr;
+ *unescaped_buf_size = buf_end - *buf_ptr;
+ }
+
+ return start_code;
+}
+
+int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
+ AVPacket *avpkt)
+{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ MJpegDecodeContext *s = avctx->priv_data;
+ const uint8_t *buf_end, *buf_ptr;
+ const uint8_t *unescaped_buf_ptr;
+ int unescaped_buf_size;
+ int start_code;
+ int i, index;
+ int ret = 0;
+
+ buf_ptr = buf;
+ buf_end = buf + buf_size;
+ while (buf_ptr < buf_end) {
+ /* find start next marker */
+ start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
+ &unescaped_buf_ptr,
+ &unescaped_buf_size);
+ /* EOF */
+ if (start_code < 0) {
+ goto the_end;
+ } else if (unescaped_buf_size > (1U<<28)) {
+ av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",
+ start_code, unescaped_buf_size, buf_size);
+ return AVERROR_INVALIDDATA;
+ } else {
+ av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
+ start_code, buf_end - buf_ptr);
+
+ init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8);
+
+ s->start_code = start_code;
+ if (s->avctx->debug & FF_DEBUG_STARTCODE)
+ av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
+
+ /* process markers */
+ if (start_code >= 0xd0 && start_code <= 0xd7)
+ av_log(avctx, AV_LOG_DEBUG,
+ "restart marker: %d\n", start_code & 0x0f);
+ /* APP fields */
+ else if (start_code >= APP0 && start_code <= APP15)
+ mjpeg_decode_app(s);
+ /* Comment */
+ else if (start_code == COM)
+ mjpeg_decode_com(s);
+
+ ret = -1;
+ switch (start_code) {
+ case SOI:
+ s->restart_interval = 0;
+ s->restart_count = 0;
+ /* nothing to do on SOI */
+ break;
+ case DQT:
+ ff_mjpeg_decode_dqt(s);
+ break;
+ case DHT:
+ if ((ret = ff_mjpeg_decode_dht(s)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
+ goto fail;
+ }
+ break;
+ case SOF0:
+ case SOF1:
+ s->lossless = 0;
+ s->ls = 0;
+ s->progressive = 0;
+ if ((ret = ff_mjpeg_decode_sof(s)) < 0)
+ goto fail;
+ break;
+ case SOF2:
+ s->lossless = 0;
+ s->ls = 0;
+ s->progressive = 1;
+ if ((ret = ff_mjpeg_decode_sof(s)) < 0)
+ goto fail;
+ break;
+ case SOF3:
+ s->lossless = 1;
+ s->ls = 0;
+ s->progressive = 0;
+ if ((ret = ff_mjpeg_decode_sof(s)) < 0)
+ goto fail;
+ break;
+ case SOF48:
+ s->lossless = 1;
+ s->ls = 1;
+ s->progressive = 0;
+ if ((ret = ff_mjpeg_decode_sof(s)) < 0)
+ goto fail;
+ break;
+ case LSE:
+ if (!CONFIG_JPEGLS_DECODER ||
+ (ret = ff_jpegls_decode_lse(s)) < 0)
+ goto fail;
+ break;
+ case EOI:
+eoi_parser:
+ s->cur_scan = 0;
+ if (!s->got_picture) {
+ av_log(avctx, AV_LOG_WARNING,
+ "Found EOI before any SOF, ignoring\n");
+ break;
+ }
+ if (s->interlaced) {
+ s->bottom_field ^= 1;
+ /* if not bottom field, do not output image yet */
+ if (s->bottom_field == !s->interlace_polarity)
+ break;
+ }
+ if ((ret = av_frame_ref(data, s->picture_ptr)) < 0)
+ return ret;
+ *got_frame = 1;
+ s->got_picture = 0;
+
+ if (!s->lossless) {
+ int qp = FFMAX3(s->qscale[0],
+ s->qscale[1],
+ s->qscale[2]);
+ int qpw = (s->width + 15) / 16;
+ AVBufferRef *qp_table_buf = av_buffer_alloc(qpw);
+ if (qp_table_buf) {
+ memset(qp_table_buf->data, qp, qpw);
+ av_frame_set_qp_table(data, qp_table_buf, 0, FF_QSCALE_TYPE_MPEG1);
+ }
+
+ if(avctx->debug & FF_DEBUG_QP)
+ av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", qp);
+ }
+
+ goto the_end;
+ case SOS:
+ if ((ret = ff_mjpeg_decode_sos(s, NULL, NULL)) < 0 &&
+ (avctx->err_recognition & AV_EF_EXPLODE))
+ goto fail;
+ break;
+ case DRI:
+ mjpeg_decode_dri(s);
+ break;
+ case SOF5:
+ case SOF6:
+ case SOF7:
+ case SOF9:
+ case SOF10:
+ case SOF11:
+ case SOF13:
+ case SOF14:
+ case SOF15:
+ case JPG:
+ av_log(avctx, AV_LOG_ERROR,
+ "mjpeg: unsupported coding type (%x)\n", start_code);
+ break;
+ }
+
+ /* eof process start code */
+ buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
+ av_log(avctx, AV_LOG_DEBUG,
+ "marker parser used %d bytes (%d bits)\n",
+ (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
+ }
+ }
+ if (s->got_picture) {
+ av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
+ goto eoi_parser;
+ }
+ av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
+ return AVERROR_INVALIDDATA;
+fail:
+ s->got_picture = 0;
+ return ret;
+the_end:
+ if (s->upscale_h) {
+ uint8_t *line = s->picture_ptr->data[s->upscale_h];
+ av_assert0(avctx->pix_fmt == AV_PIX_FMT_YUVJ444P ||
+ avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
+ avctx->pix_fmt == AV_PIX_FMT_YUVJ440P ||
+ avctx->pix_fmt == AV_PIX_FMT_YUV440P);
+ for (i = 0; i < s->chroma_height; i++) {
+ for (index = s->width - 1; index; index--)
+ line[index] = (line[index / 2] + line[(index + 1) / 2]) >> 1;
+ line += s->linesize[s->upscale_h];
+ }
+ }
+ if (s->upscale_v) {
+ uint8_t *dst = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(s->height - 1) * s->linesize[s->upscale_v]];
+ av_assert0(avctx->pix_fmt == AV_PIX_FMT_YUVJ444P ||
+ avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
+ avctx->pix_fmt == AV_PIX_FMT_YUVJ422P ||
+ avctx->pix_fmt == AV_PIX_FMT_YUV422P);
+ for (i = s->height - 1; i; i--) {
+ uint8_t *src1 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[i / 2 * s->linesize[s->upscale_v]];
+ uint8_t *src2 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(i + 1) / 2 * s->linesize[s->upscale_v]];
+ if (src1 == src2) {
+ memcpy(dst, src1, s->width);
+ } else {
+ for (index = 0; index < s->width; index++)
+ dst[index] = (src1[index] + src2[index]) >> 1;
+ }
+ dst -= s->linesize[s->upscale_v];
+ }
+ }
+ if (s->flipped && (s->avctx->flags & CODEC_FLAG_EMU_EDGE)) {
+ int hshift, vshift, j;
+ avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
+ for (index=0; index<4; index++) {
+ uint8_t *dst = s->picture_ptr->data[index];
+ int w = s->width;
+ int h = s->height;
+ if(index && index<3){
+ w = -((-w) >> hshift);
+ h = -((-h) >> vshift);
+ }
+ if(dst){
+ uint8_t *dst2 = dst + s->linesize[index]*(h-1);
+ for (i=0; i<h/2; i++) {
+ for (j=0; j<w; j++)
+ FFSWAP(int, dst[j], dst2[j]);
+ dst += s->linesize[index];
+ dst2 -= s->linesize[index];
+ }
+ }
+ }
+ }
+
+ av_log(avctx, AV_LOG_DEBUG, "decode frame unused %td bytes\n",
+ buf_end - buf_ptr);
+// return buf_end - buf_ptr;
+ return buf_ptr - buf;
+}
+
+av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
+{
+ MJpegDecodeContext *s = avctx->priv_data;
+ int i, j;
+
+ if (s->picture_ptr)
+ av_frame_unref(s->picture_ptr);
+
+ av_free(s->buffer);
+ av_freep(&s->ljpeg_buffer);
+ s->ljpeg_buffer_size = 0;
+
+ for (i = 0; i < 3; i++) {
+ for (j = 0; j < 4; j++)
+ ff_free_vlc(&s->vlcs[i][j]);
+ }
+ for (i = 0; i < MAX_COMPONENTS; i++) {
+ av_freep(&s->blocks[i]);
+ av_freep(&s->last_nnz[i]);
+ }
+ return 0;
+}
+
+static void decode_flush(AVCodecContext *avctx)
+{
+ MJpegDecodeContext *s = avctx->priv_data;
+ s->got_picture = 0;
+}
+
+#if CONFIG_MJPEG_DECODER
+#define OFFSET(x) offsetof(MJpegDecodeContext, x)
+#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
+static const AVOption options[] = {
+ { "extern_huff", "Use external huffman table.",
+ OFFSET(extern_huff), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
+ { NULL },
+};
+
+static const AVClass mjpegdec_class = {
+ .class_name = "MJPEG decoder",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVCodec ff_mjpeg_decoder = {
+ .name = "mjpeg",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_MJPEG,
+ .priv_data_size = sizeof(MJpegDecodeContext),
+ .init = ff_mjpeg_decode_init,
+ .close = ff_mjpeg_decode_end,
+ .decode = ff_mjpeg_decode_frame,
+ .flush = decode_flush,
+ .capabilities = CODEC_CAP_DR1,
+ .max_lowres = 3,
+ .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
+ .priv_class = &mjpegdec_class,
+};
+#endif
+#if CONFIG_THP_DECODER
+AVCodec ff_thp_decoder = {
+ .name = "thp",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_THP,
+ .priv_data_size = sizeof(MJpegDecodeContext),
+ .init = ff_mjpeg_decode_init,
+ .close = ff_mjpeg_decode_end,
+ .decode = ff_mjpeg_decode_frame,
+ .flush = decode_flush,
+ .capabilities = CODEC_CAP_DR1,
+ .max_lowres = 3,
+ .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
+};
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 19:17:54 +0000