From 8992cb1d0d07edc33d274f6d7924ecdf6f83d994 Mon Sep 17 00:00:00 2001 From: Tim Redfern Date: Thu, 5 Sep 2013 17:57:22 +0100 Subject: making act segmenter --- ffmpeg/libavcodec/flvdec.c | 134 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 134 insertions(+) create mode 100644 ffmpeg/libavcodec/flvdec.c (limited to 'ffmpeg/libavcodec/flvdec.c') diff --git a/ffmpeg/libavcodec/flvdec.c b/ffmpeg/libavcodec/flvdec.c new file mode 100644 index 0000000..bb693d7 --- /dev/null +++ b/ffmpeg/libavcodec/flvdec.c @@ -0,0 +1,134 @@ +/* + * FLV decoding. + * 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 "mpegvideo.h" +#include "h263.h" +#include "flv.h" +#include "libavutil/imgutils.h" + +void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last){ + int is11 = get_bits1(gb); + *last = get_bits1(gb); + *run = get_bits(gb, 6); + if(is11){ + *level = get_sbits(gb, 11); + } else { + *level = get_sbits(gb, 7); + } +} + +int ff_flv_decode_picture_header(MpegEncContext *s) +{ + int format, width, height; + + /* picture header */ + if (get_bits_long(&s->gb, 17) != 1) { + av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n"); + return AVERROR_INVALIDDATA; + } + format = get_bits(&s->gb, 5); + if (format != 0 && format != 1) { + av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n"); + return AVERROR_INVALIDDATA; + } + s->h263_flv = format+1; + s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */ + format = get_bits(&s->gb, 3); + switch (format) { + case 0: + width = get_bits(&s->gb, 8); + height = get_bits(&s->gb, 8); + break; + case 1: + width = get_bits(&s->gb, 16); + height = get_bits(&s->gb, 16); + break; + case 2: + width = 352; + height = 288; + break; + case 3: + width = 176; + height = 144; + break; + case 4: + width = 128; + height = 96; + break; + case 5: + width = 320; + height = 240; + break; + case 6: + width = 160; + height = 120; + break; + default: + width = height = 0; + break; + } + if(av_image_check_size(width, height, 0, s->avctx)) + return AVERROR(EINVAL); + s->width = width; + s->height = height; + + s->pict_type = AV_PICTURE_TYPE_I + get_bits(&s->gb, 2); + s->droppable = s->pict_type > AV_PICTURE_TYPE_P; + if (s->droppable) + s->pict_type = AV_PICTURE_TYPE_P; + + skip_bits1(&s->gb); /* deblocking flag */ + s->chroma_qscale= s->qscale = get_bits(&s->gb, 5); + + s->h263_plus = 0; + + s->unrestricted_mv = 1; + s->h263_long_vectors = 0; + + /* PEI */ + while (get_bits1(&s->gb) != 0) { + skip_bits(&s->gb, 8); + } + s->f_code = 1; + + if(s->avctx->debug & FF_DEBUG_PICT_INFO){ + av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n", + s->droppable ? 'D' : av_get_picture_type_char(s->pict_type), + s->h263_flv - 1, s->qscale, s->picture_number); + } + + s->y_dc_scale_table= + s->c_dc_scale_table= ff_mpeg1_dc_scale_table; + + return 0; +} + +AVCodec ff_flv_decoder = { + .name = "flv", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_FLV1, + .priv_data_size = sizeof(MpegEncContext), + .init = ff_h263_decode_init, + .close = ff_h263_decode_end, + .decode = ff_h263_decode_frame, + .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, + .max_lowres = 3, + .long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"), + .pix_fmts = ff_pixfmt_list_420, +}; -- cgit v1.2.3