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Diffstat (limited to 'ffmpeg1/libavcodec/qpeg.c')
| -rw-r--r-- | ffmpeg1/libavcodec/qpeg.c | 352 |
1 files changed, 352 insertions, 0 deletions
diff --git a/ffmpeg1/libavcodec/qpeg.c b/ffmpeg1/libavcodec/qpeg.c new file mode 100644 index 0000000..6015b7f --- /dev/null +++ b/ffmpeg1/libavcodec/qpeg.c @@ -0,0 +1,352 @@ +/* + * QPEG codec + * Copyright (c) 2004 Konstantin Shishkov + * + * 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 + * QPEG codec. + */ + +#include "avcodec.h" +#include "bytestream.h" +#include "internal.h" + +typedef struct QpegContext{ + AVCodecContext *avctx; + AVFrame pic, ref; + uint32_t pal[256]; + GetByteContext buffer; +} QpegContext; + +static void qpeg_decode_intra(QpegContext *qctx, uint8_t *dst, + int stride, int width, int height) +{ + int i; + int code; + int c0, c1; + int run, copy; + int filled = 0; + int rows_to_go; + + rows_to_go = height; + height--; + dst = dst + height * stride; + + while ((bytestream2_get_bytes_left(&qctx->buffer) > 0) && (rows_to_go > 0)) { + code = bytestream2_get_byte(&qctx->buffer); + run = copy = 0; + if(code == 0xFC) /* end-of-picture code */ + break; + if(code >= 0xF8) { /* very long run */ + c0 = bytestream2_get_byte(&qctx->buffer); + c1 = bytestream2_get_byte(&qctx->buffer); + run = ((code & 0x7) << 16) + (c0 << 8) + c1 + 2; + } else if (code >= 0xF0) { /* long run */ + c0 = bytestream2_get_byte(&qctx->buffer); + run = ((code & 0xF) << 8) + c0 + 2; + } else if (code >= 0xE0) { /* short run */ + run = (code & 0x1F) + 2; + } else if (code >= 0xC0) { /* very long copy */ + c0 = bytestream2_get_byte(&qctx->buffer); + c1 = bytestream2_get_byte(&qctx->buffer); + copy = ((code & 0x3F) << 16) + (c0 << 8) + c1 + 1; + } else if (code >= 0x80) { /* long copy */ + c0 = bytestream2_get_byte(&qctx->buffer); + copy = ((code & 0x7F) << 8) + c0 + 1; + } else { /* short copy */ + copy = code + 1; + } + + /* perform actual run or copy */ + if(run) { + int p; + + p = bytestream2_get_byte(&qctx->buffer); + for(i = 0; i < run; i++) { + dst[filled++] = p; + if (filled >= width) { + filled = 0; + dst -= stride; + rows_to_go--; + if(rows_to_go <= 0) + break; + } + } + } else { + for(i = 0; i < copy; i++) { + dst[filled++] = bytestream2_get_byte(&qctx->buffer); + if (filled >= width) { + filled = 0; + dst -= stride; + rows_to_go--; + if(rows_to_go <= 0) + break; + } + } + } + } +} + +static const int qpeg_table_h[16] = + { 0x00, 0x20, 0x20, 0x20, 0x18, 0x10, 0x10, 0x20, 0x10, 0x08, 0x18, 0x08, 0x08, 0x18, 0x10, 0x04}; +static const int qpeg_table_w[16] = + { 0x00, 0x20, 0x18, 0x08, 0x18, 0x10, 0x20, 0x10, 0x08, 0x10, 0x20, 0x20, 0x08, 0x10, 0x18, 0x04}; + +/* Decodes delta frames */ +static void qpeg_decode_inter(QpegContext *qctx, uint8_t *dst, + int stride, int width, int height, + int delta, const uint8_t *ctable, + uint8_t *refdata) +{ + int i, j; + int code; + int filled = 0; + int orig_height; + + if(!refdata) + refdata= dst; + + /* copy prev frame */ + for(i = 0; i < height; i++) + memcpy(dst + (i * stride), refdata + (i * stride), width); + + orig_height = height; + height--; + dst = dst + height * stride; + + while ((bytestream2_get_bytes_left(&qctx->buffer) > 0) && (height >= 0)) { + code = bytestream2_get_byte(&qctx->buffer); + + if(delta) { + /* motion compensation */ + while(bytestream2_get_bytes_left(&qctx->buffer) > 0 && (code & 0xF0) == 0xF0) { + if(delta == 1) { + int me_idx; + int me_w, me_h, me_x, me_y; + uint8_t *me_plane; + int corr, val; + + /* get block size by index */ + me_idx = code & 0xF; + me_w = qpeg_table_w[me_idx]; + me_h = qpeg_table_h[me_idx]; + + /* extract motion vector */ + corr = bytestream2_get_byte(&qctx->buffer); + + val = corr >> 4; + if(val > 7) + val -= 16; + me_x = val; + + val = corr & 0xF; + if(val > 7) + val -= 16; + me_y = val; + + /* check motion vector */ + if ((me_x + filled < 0) || (me_x + me_w + filled > width) || + (height - me_y - me_h < 0) || (height - me_y > orig_height) || + (filled + me_w > width) || (height - me_h < 0)) + av_log(NULL, AV_LOG_ERROR, "Bogus motion vector (%i,%i), block size %ix%i at %i,%i\n", + me_x, me_y, me_w, me_h, filled, height); + else { + /* do motion compensation */ + me_plane = refdata + (filled + me_x) + (height - me_y) * stride; + for(j = 0; j < me_h; j++) { + for(i = 0; i < me_w; i++) + dst[filled + i - (j * stride)] = me_plane[i - (j * stride)]; + } + } + } + code = bytestream2_get_byte(&qctx->buffer); + } + } + + if(code == 0xE0) /* end-of-picture code */ + break; + if(code > 0xE0) { /* run code: 0xE1..0xFF */ + int p; + + code &= 0x1F; + p = bytestream2_get_byte(&qctx->buffer); + for(i = 0; i <= code; i++) { + dst[filled++] = p; + if(filled >= width) { + filled = 0; + dst -= stride; + height--; + if(height < 0) + break; + } + } + } else if(code >= 0xC0) { /* copy code: 0xC0..0xDF */ + code &= 0x1F; + + if(code + 1 > bytestream2_get_bytes_left(&qctx->buffer)) + break; + + for(i = 0; i <= code; i++) { + dst[filled++] = bytestream2_get_byte(&qctx->buffer); + if(filled >= width) { + filled = 0; + dst -= stride; + height--; + if(height < 0) + break; + } + } + } else if(code >= 0x80) { /* skip code: 0x80..0xBF */ + int skip; + + code &= 0x3F; + /* codes 0x80 and 0x81 are actually escape codes, + skip value minus constant is in the next byte */ + if(!code) + skip = bytestream2_get_byte(&qctx->buffer) + 64; + else if(code == 1) + skip = bytestream2_get_byte(&qctx->buffer) + 320; + else + skip = code; + filled += skip; + while( filled >= width) { + filled -= width; + dst -= stride; + height--; + if(height < 0) + break; + } + } else { + /* zero code treated as one-pixel skip */ + if(code) { + dst[filled++] = ctable[code & 0x7F]; + } + else + filled++; + if(filled >= width) { + filled = 0; + dst -= stride; + height--; + } + } + } +} + +static int decode_frame(AVCodecContext *avctx, + void *data, int *got_frame, + AVPacket *avpkt) +{ + uint8_t ctable[128]; + QpegContext * const a = avctx->priv_data; + AVFrame * p = &a->pic; + AVFrame * ref= &a->ref; + uint8_t* outdata; + int delta, ret; + const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL); + + if (avpkt->size < 0x86) { + av_log(avctx, AV_LOG_ERROR, "Packet is too small\n"); + return AVERROR_INVALIDDATA; + } + + bytestream2_init(&a->buffer, avpkt->data, avpkt->size); + + av_frame_unref(ref); + av_frame_move_ref(ref, p); + + if ((ret = ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF)) < 0) + return ret; + outdata = a->pic.data[0]; + bytestream2_skip(&a->buffer, 4); + bytestream2_get_buffer(&a->buffer, ctable, 128); + bytestream2_skip(&a->buffer, 1); + + delta = bytestream2_get_byte(&a->buffer); + if(delta == 0x10) { + qpeg_decode_intra(a, outdata, a->pic.linesize[0], avctx->width, avctx->height); + } else { + qpeg_decode_inter(a, outdata, a->pic.linesize[0], avctx->width, avctx->height, delta, ctable, a->ref.data[0]); + } + + /* make the palette available on the way out */ + if (pal) { + a->pic.palette_has_changed = 1; + memcpy(a->pal, pal, AVPALETTE_SIZE); + } + memcpy(a->pic.data[1], a->pal, AVPALETTE_SIZE); + + if ((ret = av_frame_ref(data, &a->pic)) < 0) + return ret; + + *got_frame = 1; + + return avpkt->size; +} + +static void decode_flush(AVCodecContext *avctx){ + QpegContext * const a = avctx->priv_data; + int i, pal_size; + const uint8_t *pal_src; + + pal_size = FFMIN(1024U, avctx->extradata_size); + pal_src = avctx->extradata + avctx->extradata_size - pal_size; + + for (i=0; i<pal_size/4; i++) + a->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i); +} + +static av_cold int decode_init(AVCodecContext *avctx){ + QpegContext * const a = avctx->priv_data; + + avcodec_get_frame_defaults(&a->pic); + avcodec_get_frame_defaults(&a->ref); + a->avctx = avctx; + avctx->pix_fmt= AV_PIX_FMT_PAL8; + + decode_flush(avctx); + + avcodec_get_frame_defaults(&a->pic); + + return 0; +} + +static av_cold int decode_end(AVCodecContext *avctx){ + QpegContext * const a = avctx->priv_data; + AVFrame * const p = &a->pic; + AVFrame * const ref= &a->ref; + + av_frame_unref(p); + av_frame_unref(ref); + + return 0; +} + +AVCodec ff_qpeg_decoder = { + .name = "qpeg", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_QPEG, + .priv_data_size = sizeof(QpegContext), + .init = decode_init, + .close = decode_end, + .decode = decode_frame, + .flush = decode_flush, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("Q-team QPEG"), +}; |