forked from KolibriOS/kolibrios
ffmpeg-2.1.1: move directory
git-svn-id: svn://kolibrios.org@6148 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Sergey Semyonov (Serge)
230
contrib/sdk/sources/ffmpeg/ffmpeg-2.1/libavformat/yop.c
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230
contrib/sdk/sources/ffmpeg/ffmpeg-2.1/libavformat/yop.c
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/*
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* Psygnosis YOP demuxer
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*
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* Copyright (C) 2010 Mohamed Naufal Basheer <naufal11@gmail.com>
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* derived from the code by
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* Copyright (C) 2009 Thomas P. Higdon <thomas.p.higdon@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/channel_layout.h"
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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typedef struct yop_dec_context {
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AVPacket video_packet;
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int odd_frame;
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int frame_size;
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int audio_block_length;
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int palette_size;
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} YopDecContext;
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static int yop_probe(AVProbeData *probe_packet)
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{
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if (AV_RB16(probe_packet->buf) == AV_RB16("YO") &&
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probe_packet->buf[2]<10 &&
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probe_packet->buf[3]<10 &&
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probe_packet->buf[6] &&
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probe_packet->buf[7] &&
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!(probe_packet->buf[8] & 1) &&
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!(probe_packet->buf[10] & 1) &&
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AV_RL16(probe_packet->buf + 12 + 6) >= 920 &&
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AV_RL16(probe_packet->buf + 12 + 6) < probe_packet->buf[12] * 3 + 4 + probe_packet->buf[7] * 2048
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)
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return AVPROBE_SCORE_MAX * 3 / 4;
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return 0;
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}
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static int yop_read_header(AVFormatContext *s)
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{
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YopDecContext *yop = s->priv_data;
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AVIOContext *pb = s->pb;
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AVCodecContext *audio_dec, *video_dec;
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AVStream *audio_stream, *video_stream;
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int frame_rate, ret;
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audio_stream = avformat_new_stream(s, NULL);
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video_stream = avformat_new_stream(s, NULL);
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if (!audio_stream || !video_stream)
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return AVERROR(ENOMEM);
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// Extra data that will be passed to the decoder
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if (ff_alloc_extradata(video_stream->codec, 8))
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return AVERROR(ENOMEM);
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// Audio
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audio_dec = audio_stream->codec;
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audio_dec->codec_type = AVMEDIA_TYPE_AUDIO;
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audio_dec->codec_id = AV_CODEC_ID_ADPCM_IMA_APC;
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audio_dec->channels = 1;
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audio_dec->channel_layout = AV_CH_LAYOUT_MONO;
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audio_dec->sample_rate = 22050;
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// Video
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video_dec = video_stream->codec;
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video_dec->codec_type = AVMEDIA_TYPE_VIDEO;
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video_dec->codec_id = AV_CODEC_ID_YOP;
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avio_skip(pb, 6);
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frame_rate = avio_r8(pb);
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yop->frame_size = avio_r8(pb) * 2048;
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video_dec->width = avio_rl16(pb);
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video_dec->height = avio_rl16(pb);
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video_stream->sample_aspect_ratio = (AVRational){1, 2};
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ret = avio_read(pb, video_dec->extradata, 8);
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if (ret < 8)
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return ret < 0 ? ret : AVERROR_EOF;
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yop->palette_size = video_dec->extradata[0] * 3 + 4;
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yop->audio_block_length = AV_RL16(video_dec->extradata + 6);
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video_dec->bit_rate = 8 * (yop->frame_size - yop->audio_block_length) * frame_rate;
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// 1840 samples per frame, 1 nibble per sample; hence 1840/2 = 920
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if (yop->audio_block_length < 920 ||
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yop->audio_block_length + yop->palette_size >= yop->frame_size) {
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av_log(s, AV_LOG_ERROR, "YOP has invalid header\n");
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return AVERROR_INVALIDDATA;
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}
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avio_seek(pb, 2048, SEEK_SET);
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avpriv_set_pts_info(video_stream, 32, 1, frame_rate);
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return 0;
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}
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static int yop_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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YopDecContext *yop = s->priv_data;
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AVIOContext *pb = s->pb;
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int ret;
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int actual_video_data_size = yop->frame_size -
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yop->audio_block_length - yop->palette_size;
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yop->video_packet.stream_index = 1;
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if (yop->video_packet.data) {
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*pkt = yop->video_packet;
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yop->video_packet.data = NULL;
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yop->video_packet.buf = NULL;
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#if FF_API_DESTRUCT_PACKET
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FF_DISABLE_DEPRECATION_WARNINGS
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yop->video_packet.destruct = NULL;
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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yop->video_packet.size = 0;
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pkt->data[0] = yop->odd_frame;
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pkt->flags |= AV_PKT_FLAG_KEY;
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yop->odd_frame ^= 1;
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return pkt->size;
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}
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ret = av_new_packet(&yop->video_packet,
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yop->frame_size - yop->audio_block_length);
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if (ret < 0)
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return ret;
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yop->video_packet.pos = avio_tell(pb);
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ret = avio_read(pb, yop->video_packet.data, yop->palette_size);
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if (ret < 0) {
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goto err_out;
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}else if (ret < yop->palette_size) {
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ret = AVERROR_EOF;
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goto err_out;
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}
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ret = av_get_packet(pb, pkt, 920);
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if (ret < 0)
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goto err_out;
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// Set position to the start of the frame
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pkt->pos = yop->video_packet.pos;
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avio_skip(pb, yop->audio_block_length - ret);
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ret = avio_read(pb, yop->video_packet.data + yop->palette_size,
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actual_video_data_size);
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if (ret < 0)
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goto err_out;
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else if (ret < actual_video_data_size)
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av_shrink_packet(&yop->video_packet, yop->palette_size + ret);
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// Arbitrarily return the audio data first
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return yop->audio_block_length;
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err_out:
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av_free_packet(&yop->video_packet);
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return ret;
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}
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static int yop_read_close(AVFormatContext *s)
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{
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YopDecContext *yop = s->priv_data;
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av_free_packet(&yop->video_packet);
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return 0;
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}
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static int yop_read_seek(AVFormatContext *s, int stream_index,
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int64_t timestamp, int flags)
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{
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YopDecContext *yop = s->priv_data;
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int64_t frame_pos, pos_min, pos_max;
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int frame_count;
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if (!stream_index)
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return -1;
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pos_min = s->data_offset;
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pos_max = avio_size(s->pb) - yop->frame_size;
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frame_count = (pos_max - pos_min) / yop->frame_size;
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timestamp = FFMAX(0, FFMIN(frame_count, timestamp));
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frame_pos = timestamp * yop->frame_size + pos_min;
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if (avio_seek(s->pb, frame_pos, SEEK_SET) < 0)
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return -1;
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av_free_packet(&yop->video_packet);
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yop->odd_frame = timestamp & 1;
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return 0;
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}
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AVInputFormat ff_yop_demuxer = {
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.name = "yop",
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.long_name = NULL_IF_CONFIG_SMALL("Psygnosis YOP"),
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.priv_data_size = sizeof(YopDecContext),
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.read_probe = yop_probe,
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.read_header = yop_read_header,
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.read_packet = yop_read_packet,
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.read_close = yop_read_close,
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.read_seek = yop_read_seek,
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.extensions = "yop",
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.flags = AVFMT_GENERIC_INDEX,
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};
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