| /* |
| * 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 "avcodec.h" |
| |
| static int parse(AVCodecParserContext *s, |
| AVCodecContext *avctx, |
| const uint8_t **poutbuf, int *poutbuf_size, |
| const uint8_t *buf, int buf_size) |
| { |
| unsigned int frame_type; |
| unsigned int profile; |
| |
| *poutbuf = buf; |
| *poutbuf_size = buf_size; |
| |
| if (buf_size < 3) |
| return buf_size; |
| |
| frame_type = buf[0] & 1; |
| profile = (buf[0] >> 1) & 7; |
| if (profile > 3) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid profile %u.\n", profile); |
| return buf_size; |
| } |
| |
| avctx->profile = profile; |
| s->key_frame = frame_type == 0; |
| s->pict_type = frame_type ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I; |
| s->format = AV_PIX_FMT_YUV420P; |
| s->field_order = AV_FIELD_PROGRESSIVE; |
| s->picture_structure = AV_PICTURE_STRUCTURE_FRAME; |
| |
| if (frame_type == 0) { |
| unsigned int sync_code; |
| unsigned int width, height; |
| |
| if (buf_size < 10) |
| return buf_size; |
| |
| sync_code = AV_RL24(buf + 3); |
| if (sync_code != 0x2a019d) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid sync code %06x.\n", sync_code); |
| return buf_size; |
| } |
| |
| width = AV_RL16(buf + 6) & 0x3fff; |
| height = AV_RL16(buf + 8) & 0x3fff; |
| |
| s->width = width; |
| s->height = height; |
| s->coded_width = FFALIGN(width, 16); |
| s->coded_height = FFALIGN(height, 16); |
| } |
| |
| return buf_size; |
| } |
| |
| AVCodecParser ff_vp8_parser = { |
| .codec_ids = { AV_CODEC_ID_VP8 }, |
| .parser_parse = parse, |
| }; |