| 0,0 → 1,137 |
|---|
| /* |
| * 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->ehc_mode) |
| s->avctx->sample_aspect_ratio= (AVRational){1,2}; |
| |
| 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", |
| .long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"), |
| .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, |
| .pix_fmts = ff_pixfmt_list_420, |
| }; |