move AVCodecParser prototypes and definitions to parser.h, and move mpegvideo parser to mpeg12.c
Originally committed as revision 6914 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier
@@ -3312,6 +3312,169 @@ AVCodec mpeg_xvmc_decoder = {
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#endif
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#ifdef CONFIG_MPEGVIDEO_PARSER
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static void mpegvideo_extract_headers(AVCodecParserContext *s,
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AVCodecContext *avctx,
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const uint8_t *buf, int buf_size)
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{
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ParseContext1 *pc = s->priv_data;
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const uint8_t *buf_end;
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uint32_t start_code;
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int frame_rate_index, ext_type, bytes_left;
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int frame_rate_ext_n, frame_rate_ext_d;
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int picture_structure, top_field_first, repeat_first_field, progressive_frame;
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int horiz_size_ext, vert_size_ext, bit_rate_ext;
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//FIXME replace the crap with get_bits()
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s->repeat_pict = 0;
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buf_end = buf + buf_size;
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while (buf < buf_end) {
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start_code= -1;
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buf= ff_find_start_code(buf, buf_end, &start_code);
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bytes_left = buf_end - buf;
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switch(start_code) {
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case PICTURE_START_CODE:
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if (bytes_left >= 2) {
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s->pict_type = (buf[1] >> 3) & 7;
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}
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break;
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case SEQ_START_CODE:
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if (bytes_left >= 7) {
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pc->width = (buf[0] << 4) | (buf[1] >> 4);
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pc->height = ((buf[1] & 0x0f) << 8) | buf[2];
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avcodec_set_dimensions(avctx, pc->width, pc->height);
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frame_rate_index = buf[3] & 0xf;
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pc->frame_rate.den = avctx->time_base.den = ff_frame_rate_tab[frame_rate_index].num;
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pc->frame_rate.num = avctx->time_base.num = ff_frame_rate_tab[frame_rate_index].den;
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avctx->bit_rate = ((buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6))*400;
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avctx->codec_id = CODEC_ID_MPEG1VIDEO;
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avctx->sub_id = 1;
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}
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break;
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case EXT_START_CODE:
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if (bytes_left >= 1) {
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ext_type = (buf[0] >> 4);
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switch(ext_type) {
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case 0x1: /* sequence extension */
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if (bytes_left >= 6) {
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horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7);
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vert_size_ext = (buf[2] >> 5) & 3;
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bit_rate_ext = ((buf[2] & 0x1F)<<7) | (buf[3]>>1);
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frame_rate_ext_n = (buf[5] >> 5) & 3;
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frame_rate_ext_d = (buf[5] & 0x1f);
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pc->progressive_sequence = buf[1] & (1 << 3);
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avctx->has_b_frames= !(buf[5] >> 7);
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pc->width |=(horiz_size_ext << 12);
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pc->height |=( vert_size_ext << 12);
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avctx->bit_rate += (bit_rate_ext << 18) * 400;
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avcodec_set_dimensions(avctx, pc->width, pc->height);
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avctx->time_base.den = pc->frame_rate.den * (frame_rate_ext_n + 1);
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avctx->time_base.num = pc->frame_rate.num * (frame_rate_ext_d + 1);
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avctx->codec_id = CODEC_ID_MPEG2VIDEO;
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avctx->sub_id = 2; /* forces MPEG2 */
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}
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break;
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case 0x8: /* picture coding extension */
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if (bytes_left >= 5) {
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picture_structure = buf[2]&3;
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top_field_first = buf[3] & (1 << 7);
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repeat_first_field = buf[3] & (1 << 1);
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progressive_frame = buf[4] & (1 << 7);
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/* check if we must repeat the frame */
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if (repeat_first_field) {
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if (pc->progressive_sequence) {
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if (top_field_first)
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s->repeat_pict = 4;
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else
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s->repeat_pict = 2;
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} else if (progressive_frame) {
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s->repeat_pict = 1;
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}
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}
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/* the packet only represents half a frame
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XXX,FIXME maybe find a different solution */
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if(picture_structure != 3)
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s->repeat_pict = -1;
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}
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break;
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}
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}
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break;
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case -1:
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goto the_end;
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default:
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/* we stop parsing when we encounter a slice. It ensures
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that this function takes a negligible amount of time */
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if (start_code >= SLICE_MIN_START_CODE &&
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start_code <= SLICE_MAX_START_CODE)
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goto the_end;
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break;
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}
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}
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the_end: ;
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}
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static int mpegvideo_parse(AVCodecParserContext *s,
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AVCodecContext *avctx,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size)
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{
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ParseContext1 *pc1 = s->priv_data;
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ParseContext *pc= &pc1->pc;
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int next;
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if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
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next= buf_size;
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}else{
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next= ff_mpeg1_find_frame_end(pc, buf, buf_size);
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if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
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*poutbuf = NULL;
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*poutbuf_size = 0;
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return buf_size;
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}
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}
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/* we have a full frame : we just parse the first few MPEG headers
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to have the full timing information. The time take by this
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function should be negligible for uncorrupted streams */
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mpegvideo_extract_headers(s, avctx, buf, buf_size);
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#if 0
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printf("pict_type=%d frame_rate=%0.3f repeat_pict=%d\n",
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s->pict_type, (double)avctx->time_base.den / avctx->time_base.num, s->repeat_pict);
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#endif
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*poutbuf = (uint8_t *)buf;
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*poutbuf_size = buf_size;
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return next;
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}
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static int mpegvideo_split(AVCodecContext *avctx,
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const uint8_t *buf, int buf_size)
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{
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int i;
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uint32_t state= -1;
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for(i=0; i<buf_size; i++){
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state= (state<<8) | buf[i];
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if(state != 0x1B3 && state != 0x1B5 && state < 0x200 && state >= 0x100)
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return i-3;
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}
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return 0;
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}
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AVCodecParser mpegvideo_parser = {
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{ CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO },
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sizeof(ParseContext1),
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NULL,
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mpegvideo_parse,
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ff_parse1_close,
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mpegvideo_split,
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};
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#endif /* !CONFIG_MPEGVIDEO_PARSER */
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/* this is ugly i know, but the alternative is too make
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hundreds of vars global and prefix them with ff_mpeg1_
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which is far uglier. */
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