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-rw-r--r--ffmpeg/libavcodec/cllc.c398
1 files changed, 398 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/cllc.c b/ffmpeg/libavcodec/cllc.c
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--- /dev/null
+++ b/ffmpeg/libavcodec/cllc.c
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+/*
+ * Canopus Lossless Codec decoder
+ *
+ * Copyright (c) 2012 Derek Buitenhuis
+ *
+ * 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
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "dsputil.h"
+#include "get_bits.h"
+#include "avcodec.h"
+#include "internal.h"
+
+typedef struct CLLCContext {
+ DSPContext dsp;
+ AVCodecContext *avctx;
+
+ uint8_t *swapped_buf;
+ int swapped_buf_size;
+} CLLCContext;
+
+static int read_code_table(CLLCContext *ctx, GetBitContext *gb, VLC *vlc)
+{
+ uint8_t symbols[256];
+ uint8_t bits[256];
+ uint16_t codes[256];
+ int num_lens, num_codes, num_codes_sum, prefix;
+ int i, j, count;
+
+ prefix = 0;
+ count = 0;
+ num_codes_sum = 0;
+
+ num_lens = get_bits(gb, 5);
+
+ for (i = 0; i < num_lens; i++) {
+ num_codes = get_bits(gb, 9);
+ num_codes_sum += num_codes;
+
+ if (num_codes_sum > 256) {
+ vlc->table = NULL;
+
+ av_log(ctx->avctx, AV_LOG_ERROR,
+ "Too many VLCs (%d) to be read.\n", num_codes_sum);
+ return AVERROR_INVALIDDATA;
+ }
+
+ for (j = 0; j < num_codes; j++) {
+ symbols[count] = get_bits(gb, 8);
+ bits[count] = i + 1;
+ codes[count] = prefix++;
+
+ count++;
+ }
+
+ prefix <<= 1;
+ }
+
+ return ff_init_vlc_sparse(vlc, 7, count, bits, 1, 1,
+ codes, 2, 2, symbols, 1, 1, 0);
+}
+
+/*
+ * Unlike the RGB24 read/restore, which reads in a component at a time,
+ * ARGB read/restore reads in ARGB quads.
+ */
+static int read_argb_line(CLLCContext *ctx, GetBitContext *gb, int *top_left,
+ VLC *vlc, uint8_t *outbuf)
+{
+ uint8_t *dst;
+ int pred[4];
+ int code;
+ int i;
+
+ OPEN_READER(bits, gb);
+
+ dst = outbuf;
+ pred[0] = top_left[0];
+ pred[1] = top_left[1];
+ pred[2] = top_left[2];
+ pred[3] = top_left[3];
+
+ for (i = 0; i < ctx->avctx->width; i++) {
+ /* Always get the alpha component */
+ UPDATE_CACHE(bits, gb);
+ GET_VLC(code, bits, gb, vlc[0].table, 7, 2);
+
+ pred[0] += code;
+ dst[0] = pred[0];
+
+ /* Skip the components if they are entirely transparent */
+ if (dst[0]) {
+ /* Red */
+ UPDATE_CACHE(bits, gb);
+ GET_VLC(code, bits, gb, vlc[1].table, 7, 2);
+
+ pred[1] += code;
+ dst[1] = pred[1];
+
+ /* Green */
+ UPDATE_CACHE(bits, gb);
+ GET_VLC(code, bits, gb, vlc[2].table, 7, 2);
+
+ pred[2] += code;
+ dst[2] = pred[2];
+
+ /* Blue */
+ UPDATE_CACHE(bits, gb);
+ GET_VLC(code, bits, gb, vlc[3].table, 7, 2);
+
+ pred[3] += code;
+ dst[3] = pred[3];
+ } else {
+ dst[1] = 0;
+ dst[2] = 0;
+ dst[3] = 0;
+ }
+
+ dst += 4;
+ }
+
+ CLOSE_READER(bits, gb);
+
+ dst -= 4 * ctx->avctx->width;
+ top_left[0] = dst[0];
+
+ /* Only stash components if they are not transparent */
+ if (top_left[0]) {
+ top_left[1] = dst[1];
+ top_left[2] = dst[2];
+ top_left[3] = dst[3];
+ }
+
+ return 0;
+}
+
+static int read_rgb24_component_line(CLLCContext *ctx, GetBitContext *gb,
+ int *top_left, VLC *vlc, uint8_t *outbuf)
+{
+ uint8_t *dst;
+ int pred, code;
+ int i;
+
+ OPEN_READER(bits, gb);
+
+ dst = outbuf;
+ pred = *top_left;
+
+ /* Simultaneously read and restore the line */
+ for (i = 0; i < ctx->avctx->width; i++) {
+ UPDATE_CACHE(bits, gb);
+ GET_VLC(code, bits, gb, vlc->table, 7, 2);
+
+ pred += code;
+ dst[0] = pred;
+ dst += 3;
+ }
+
+ CLOSE_READER(bits, gb);
+
+ /* Stash the first pixel */
+ *top_left = dst[-3 * ctx->avctx->width];
+
+ return 0;
+}
+
+static int decode_argb_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic)
+{
+ AVCodecContext *avctx = ctx->avctx;
+ uint8_t *dst;
+ int pred[4];
+ int ret;
+ int i, j;
+ VLC vlc[4];
+
+ pred[0] = 0;
+ pred[1] = 0x80;
+ pred[2] = 0x80;
+ pred[3] = 0x80;
+
+ dst = pic->data[0];
+
+ skip_bits(gb, 16);
+
+ /* Read in code table for each plane */
+ for (i = 0; i < 4; i++) {
+ ret = read_code_table(ctx, gb, &vlc[i]);
+ if (ret < 0) {
+ for (j = 0; j <= i; j++)
+ ff_free_vlc(&vlc[j]);
+
+ av_log(ctx->avctx, AV_LOG_ERROR,
+ "Could not read code table %d.\n", i);
+ return ret;
+ }
+ }
+
+ /* Read in and restore every line */
+ for (i = 0; i < avctx->height; i++) {
+ read_argb_line(ctx, gb, pred, vlc, dst);
+
+ dst += pic->linesize[0];
+ }
+
+ for (i = 0; i < 4; i++)
+ ff_free_vlc(&vlc[i]);
+
+ return 0;
+}
+
+static int decode_rgb24_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic)
+{
+ AVCodecContext *avctx = ctx->avctx;
+ uint8_t *dst;
+ int pred[3];
+ int ret;
+ int i, j;
+ VLC vlc[3];
+
+ pred[0] = 0x80;
+ pred[1] = 0x80;
+ pred[2] = 0x80;
+
+ dst = pic->data[0];
+
+ skip_bits(gb, 16);
+
+ /* Read in code table for each plane */
+ for (i = 0; i < 3; i++) {
+ ret = read_code_table(ctx, gb, &vlc[i]);
+ if (ret < 0) {
+ for (j = 0; j <= i; j++)
+ ff_free_vlc(&vlc[j]);
+
+ av_log(ctx->avctx, AV_LOG_ERROR,
+ "Could not read code table %d.\n", i);
+ return ret;
+ }
+ }
+
+ /* Read in and restore every line */
+ for (i = 0; i < avctx->height; i++) {
+ for (j = 0; j < 3; j++)
+ read_rgb24_component_line(ctx, gb, &pred[j], &vlc[j], &dst[j]);
+
+ dst += pic->linesize[0];
+ }
+
+ for (i = 0; i < 3; i++)
+ ff_free_vlc(&vlc[i]);
+
+ return 0;
+}
+
+static int cllc_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_picture_ptr, AVPacket *avpkt)
+{
+ CLLCContext *ctx = avctx->priv_data;
+ AVFrame *pic = data;
+ uint8_t *src = avpkt->data;
+ uint32_t info_tag, info_offset;
+ int data_size;
+ GetBitContext gb;
+ int coding_type, ret;
+
+ /* Skip the INFO header if present */
+ info_offset = 0;
+ info_tag = AV_RL32(src);
+ if (info_tag == MKTAG('I', 'N', 'F', 'O')) {
+ info_offset = AV_RL32(src + 4);
+ if (info_offset > UINT32_MAX - 8 || info_offset + 8 > avpkt->size) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Invalid INFO header offset: 0x%08X is too large.\n",
+ info_offset);
+ return AVERROR_INVALIDDATA;
+ }
+
+ info_offset += 8;
+ src += info_offset;
+
+ av_log(avctx, AV_LOG_DEBUG, "Skipping INFO chunk.\n");
+ }
+
+ data_size = (avpkt->size - info_offset) & ~1;
+
+ /* Make sure our bswap16'd buffer is big enough */
+ av_fast_padded_malloc(&ctx->swapped_buf,
+ &ctx->swapped_buf_size, data_size);
+ if (!ctx->swapped_buf) {
+ av_log(avctx, AV_LOG_ERROR, "Could not allocate swapped buffer.\n");
+ return AVERROR(ENOMEM);
+ }
+
+ /* bswap16 the buffer since CLLC's bitreader works in 16-bit words */
+ ctx->dsp.bswap16_buf((uint16_t *) ctx->swapped_buf, (uint16_t *) src,
+ data_size / 2);
+
+ init_get_bits(&gb, ctx->swapped_buf, data_size * 8);
+
+ /*
+ * Read in coding type. The types are as follows:
+ *
+ * 0 - YUY2
+ * 1 - BGR24 (Triples)
+ * 2 - BGR24 (Quads)
+ * 3 - BGRA
+ */
+ coding_type = (AV_RL32(src) >> 8) & 0xFF;
+ av_log(avctx, AV_LOG_DEBUG, "Frame coding type: %d\n", coding_type);
+
+ switch (coding_type) {
+ case 1:
+ case 2:
+ avctx->pix_fmt = AV_PIX_FMT_RGB24;
+ avctx->bits_per_raw_sample = 8;
+
+ if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
+ return ret;
+
+ ret = decode_rgb24_frame(ctx, &gb, pic);
+ if (ret < 0)
+ return ret;
+
+ break;
+ case 3:
+ avctx->pix_fmt = AV_PIX_FMT_ARGB;
+ avctx->bits_per_raw_sample = 8;
+
+ if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
+ return ret;
+
+ ret = decode_argb_frame(ctx, &gb, pic);
+ if (ret < 0)
+ return ret;
+
+ break;
+ default:
+ av_log(avctx, AV_LOG_ERROR, "Unknown coding type: %d.\n", coding_type);
+ return AVERROR_INVALIDDATA;
+ }
+
+ pic->key_frame = 1;
+ pic->pict_type = AV_PICTURE_TYPE_I;
+
+ *got_picture_ptr = 1;
+
+ return avpkt->size;
+}
+
+static av_cold int cllc_decode_close(AVCodecContext *avctx)
+{
+ CLLCContext *ctx = avctx->priv_data;
+
+ av_freep(&ctx->swapped_buf);
+
+ return 0;
+}
+
+static av_cold int cllc_decode_init(AVCodecContext *avctx)
+{
+ CLLCContext *ctx = avctx->priv_data;
+
+ /* Initialize various context values */
+ ctx->avctx = avctx;
+ ctx->swapped_buf = NULL;
+ ctx->swapped_buf_size = 0;
+
+ ff_dsputil_init(&ctx->dsp, avctx);
+
+ return 0;
+}
+
+AVCodec ff_cllc_decoder = {
+ .name = "cllc",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_CLLC,
+ .priv_data_size = sizeof(CLLCContext),
+ .init = cllc_decode_init,
+ .decode = cllc_decode_frame,
+ .close = cllc_decode_close,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Canopus Lossless Codec"),
+};
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