mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>pull/2/head
Paul B Mahol
13 years ago
committed by
Michael Niedermayer
parent
9eae8396f1
commit
a4209ad631
6 changed files with 188 additions and 1 deletions
@ -0,0 +1,183 @@ |
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/*
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* SMJPEG demuxer |
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* Copyright (c) 2011 Paul B Mahol |
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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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/**
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* @file |
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* This is a demuxer for Loki SDL MJPEG files |
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*/ |
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#include "avformat.h" |
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#include "internal.h" |
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#include "riff.h" |
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static const AVCodecTag codec_smjpeg_tags[] = { |
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{ CODEC_ID_ADPCM_IMA_SMJPEG, MKTAG('A', 'P', 'C', 'M') }, |
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{ CODEC_ID_PCM_S16LE, MKTAG('N', 'O', 'N', 'E') }, |
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{ CODEC_ID_MJPEG, MKTAG('J', 'F', 'I', 'F') }, |
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{ CODEC_ID_NONE, 0 }, |
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}; |
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typedef struct SMJPEGContext { |
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int audio_stream_index; |
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int video_stream_index; |
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} SMJPEGContext; |
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static int smjpeg_probe(AVProbeData *p) |
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{ |
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if (!memcmp(p->buf, "\x0\xaSMJPEG", 8)) |
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return AVPROBE_SCORE_MAX; |
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return 0; |
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} |
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static int smjpeg_read_header(AVFormatContext *s, AVFormatParameters *ap) |
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{ |
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SMJPEGContext *sc = s->priv_data; |
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AVStream *ast = NULL, *vst = NULL; |
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AVIOContext *pb = s->pb; |
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uint32_t version, htype, hlength, duration; |
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char *comment; |
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avio_skip(pb, 8); // magic
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version = avio_rb32(pb); |
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if (version) { |
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av_log_ask_for_sample(s, "unknown version %d\n", version); |
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} |
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duration = avio_rb32(pb); // in msec
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while (!pb->eof_reached) { |
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htype = avio_rl32(pb); |
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switch (htype) { |
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case MKTAG('_', 'T', 'X', 'T'): |
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hlength = avio_rb32(pb); |
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if (!hlength || hlength > 512) |
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return AVERROR_INVALIDDATA; |
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comment = av_malloc(hlength + 1); |
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if (!comment) |
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return AVERROR(ENOMEM); |
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if (avio_read(pb, comment, hlength) != hlength) { |
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av_freep(&comment); |
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av_log(s, AV_LOG_ERROR, "error when reading comment\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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comment[hlength] = 0; |
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av_dict_set(&s->metadata, "comment", comment, |
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AV_DICT_DONT_STRDUP_VAL); |
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break; |
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case MKTAG('_', 'S', 'N', 'D'): |
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if (ast) { |
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av_log_ask_for_sample(s, "multiple audio streams not supported\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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hlength = avio_rb32(pb); |
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if (hlength < 8) |
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return AVERROR_INVALIDDATA; |
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ast = avformat_new_stream(s, 0); |
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if (!ast) |
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return AVERROR(ENOMEM); |
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ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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ast->codec->sample_rate = avio_rb16(pb); |
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ast->codec->bits_per_coded_sample = avio_r8(pb); |
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ast->codec->channels = avio_r8(pb); |
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ast->codec->codec_tag = avio_rl32(pb); |
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ast->codec->codec_id = ff_codec_get_id(codec_smjpeg_tags, |
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ast->codec->codec_tag); |
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ast->duration = duration; |
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sc->audio_stream_index = ast->index; |
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avpriv_set_pts_info(ast, 32, 1, 1000); |
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avio_skip(pb, hlength - 8); |
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break; |
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case MKTAG('_', 'V', 'I', 'D'): |
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if (vst) { |
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av_log_ask_for_sample(s, "multiple video streams not supported\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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hlength = avio_rb32(pb); |
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if (hlength < 12) |
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return AVERROR_INVALIDDATA; |
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avio_skip(pb, 4); // number of frames
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vst = avformat_new_stream(s, 0); |
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if (!vst) |
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return AVERROR(ENOMEM); |
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vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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vst->codec->width = avio_rb16(pb); |
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vst->codec->height = avio_rb16(pb); |
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vst->codec->codec_tag = avio_rl32(pb); |
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vst->codec->codec_id = ff_codec_get_id(codec_smjpeg_tags, |
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vst->codec->codec_tag); |
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vst->duration = duration; |
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sc->video_stream_index = vst->index; |
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avpriv_set_pts_info(vst, 32, 1, 1000); |
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avio_skip(pb, hlength - 12); |
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break; |
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case MKTAG('H', 'E', 'N', 'D'): |
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return 0; |
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default: |
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av_log(s, AV_LOG_ERROR, "unknown header %x\n", htype); |
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return AVERROR_INVALIDDATA; |
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} |
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} |
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return AVERROR_EOF; |
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} |
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static int smjpeg_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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SMJPEGContext *sc = s->priv_data; |
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uint32_t dtype, ret, size, timestamp; |
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if (s->pb->eof_reached) |
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return AVERROR_EOF; |
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dtype = avio_rl32(s->pb); |
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switch (dtype) { |
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case MKTAG('s', 'n', 'd', 'D'): |
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timestamp = avio_rb32(s->pb); |
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size = avio_rb32(s->pb); |
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ret = av_get_packet(s->pb, pkt, size); |
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pkt->stream_index = sc->audio_stream_index; |
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pkt->pts = timestamp; |
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break; |
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case MKTAG('v', 'i', 'd', 'D'): |
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timestamp = avio_rb32(s->pb); |
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size = avio_rb32(s->pb); |
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ret = av_get_packet(s->pb, pkt, size); |
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pkt->stream_index = sc->video_stream_index; |
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pkt->pts = timestamp; |
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break; |
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case MKTAG('D', 'O', 'N', 'E'): |
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ret = AVERROR_EOF; |
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break; |
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default: |
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av_log(s, AV_LOG_ERROR, "unknown chunk %x\n", dtype); |
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ret = AVERROR_INVALIDDATA; |
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break; |
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} |
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return ret; |
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} |
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AVInputFormat ff_smjpeg_demuxer = { |
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.name = "smjpeg", |
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.long_name = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"), |
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.priv_data_size = sizeof(SMJPEGContext), |
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.read_probe = smjpeg_probe, |
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.read_header = smjpeg_read_header, |
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.read_packet = smjpeg_read_packet, |
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.extensions = "mjpg", |
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}; |
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