libavformat/r3d.c - nest-android-app/ffmpeg - Git at Google

 /*
  * R3D REDCODE demuxer
  * Copyright (c) 2008 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
  *
  * 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 "libavutil/dict.h"
 #include "libavutil/mathematics.h"
 #include "avformat.h"
 #include "internal.h"

 typedef struct R3DContext {
     unsigned video_offsets_count;
     unsigned *video_offsets;
     unsigned rdvo_offset;

     int audio_channels;
 } R3DContext;

 typedef struct Atom {
     unsigned size;
     uint32_t tag;
     uint64_t offset;
 } Atom;

 static int read_atom(AVFormatContext *s, Atom *atom)
 {
     atom->offset = avio_tell(s->pb);
     atom->size = avio_rb32(s->pb);
     if (atom->size < 8)
         return -1;
     atom->tag = avio_rl32(s->pb);
     av_log(s, AV_LOG_TRACE, "atom %u %.4s offset %#"PRIx64"\n",
             atom->size, (char*)&atom->tag, atom->offset);
     return atom->size;
 }

 static int r3d_read_red1(AVFormatContext *s)
 {
     AVStream *st = avformat_new_stream(s, NULL);
     R3DContext *r3d = s->priv_data;
     char filename[258];
     int tmp;
     int av_unused tmp2;
     AVRational framerate;

     if (!st)
         return AVERROR(ENOMEM);
     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
     st->codec->codec_id = AV_CODEC_ID_JPEG2000;

     tmp  = avio_r8(s->pb); // major version
     tmp2 = avio_r8(s->pb); // minor version
     av_log(s, AV_LOG_TRACE, "version %d.%d\n", tmp, tmp2);

     tmp = avio_rb16(s->pb); // unknown
     av_log(s, AV_LOG_TRACE, "unknown1 %d\n", tmp);

     tmp = avio_rb32(s->pb);
     avpriv_set_pts_info(st, 32, 1, tmp);

     tmp = avio_rb32(s->pb); // filenum
     av_log(s, AV_LOG_TRACE, "filenum %d\n", tmp);

     avio_skip(s->pb, 32); // unknown

     st->codec->width  = avio_rb32(s->pb);
     st->codec->height = avio_rb32(s->pb);

     tmp = avio_rb16(s->pb); // unknown
     av_log(s, AV_LOG_TRACE, "unknown2 %d\n", tmp);

     framerate.num = avio_rb16(s->pb);
     framerate.den = avio_rb16(s->pb);
     if (framerate.num > 0 && framerate.den > 0) {
 #if FF_API_R_FRAME_RATE
         st->r_frame_rate =
 #endif
         st->avg_frame_rate = framerate;
     }

     r3d->audio_channels = avio_r8(s->pb); // audio channels
     av_log(s, AV_LOG_TRACE, "audio channels %d\n", tmp);

     avio_read(s->pb, filename, 257);
     filename[sizeof(filename)-1] = 0;
     av_dict_set(&st->metadata, "filename", filename, 0);

     av_log(s, AV_LOG_TRACE, "filename %s\n", filename);
     av_log(s, AV_LOG_TRACE, "resolution %dx%d\n", st->codec->width, st->codec->height);
     av_log(s, AV_LOG_TRACE, "timescale %d\n", st->time_base.den);
     av_log(s, AV_LOG_TRACE, "frame rate %d/%d\n",
             framerate.num, framerate.den);

     return 0;
 }

 static int r3d_read_rdvo(AVFormatContext *s, Atom *atom)
 {
     R3DContext *r3d = s->priv_data;
     AVStream *st = s->streams[0];
     int i;

     r3d->video_offsets_count = (atom->size - 8) / 4;
     r3d->video_offsets = av_malloc(atom->size);
     if (!r3d->video_offsets)
         return AVERROR(ENOMEM);

     for (i = 0; i < r3d->video_offsets_count; i++) {
         r3d->video_offsets[i] = avio_rb32(s->pb);
         if (!r3d->video_offsets[i]) {
             r3d->video_offsets_count = i;
             break;
         }
         av_log(s, AV_LOG_TRACE, "video offset %d: %#x\n", i, r3d->video_offsets[i]);
     }

     if (st->avg_frame_rate.num)
         st->duration = av_rescale_q(r3d->video_offsets_count,
                                     av_inv_q(st->avg_frame_rate),
                                     st->time_base);
     av_log(s, AV_LOG_TRACE, "duration %"PRId64"\n", st->duration);

     return 0;
 }

 static void r3d_read_reos(AVFormatContext *s)
 {
     R3DContext *r3d = s->priv_data;
     int av_unused tmp;

     r3d->rdvo_offset = avio_rb32(s->pb);
     avio_rb32(s->pb); // rdvs offset
     avio_rb32(s->pb); // rdao offset
     avio_rb32(s->pb); // rdas offset

     tmp = avio_rb32(s->pb);
     av_log(s, AV_LOG_TRACE, "num video chunks %d\n", tmp);

     tmp = avio_rb32(s->pb);
     av_log(s, AV_LOG_TRACE, "num audio chunks %d\n", tmp);

     avio_skip(s->pb, 6*4);
 }

 static int r3d_read_header(AVFormatContext *s)
 {
     R3DContext *r3d = s->priv_data;
     Atom atom;
     int ret;

     if (read_atom(s, &atom) < 0) {
         av_log(s, AV_LOG_ERROR, "error reading atom\n");
         return -1;
     }
     if (atom.tag == MKTAG('R','E','D','1')) {
         if ((ret = r3d_read_red1(s)) < 0) {
             av_log(s, AV_LOG_ERROR, "error parsing 'red1' atom\n");
             return ret;
         }
     } else {
         av_log(s, AV_LOG_ERROR, "could not find 'red1' atom\n");
         return -1;
     }

     /* we cannot create the audio stream now because we do not know the
      * sample rate */
     if (r3d->audio_channels)
         s->ctx_flags |= AVFMTCTX_NOHEADER;

     s->internal->data_offset = avio_tell(s->pb);
     av_log(s, AV_LOG_TRACE, "data offset %#"PRIx64"\n", s->internal->data_offset);
     if (!s->pb->seekable)
         return 0;
     // find REOB/REOF/REOS to load index
     avio_seek(s->pb, avio_size(s->pb)-48-8, SEEK_SET);
     if (read_atom(s, &atom) < 0)
         av_log(s, AV_LOG_ERROR, "error reading end atom\n");

     if (atom.tag != MKTAG('R','E','O','B') &&
         atom.tag != MKTAG('R','E','O','F') &&
         atom.tag != MKTAG('R','E','O','S'))
         goto out;

     r3d_read_reos(s);

     if (r3d->rdvo_offset) {
         avio_seek(s->pb, r3d->rdvo_offset, SEEK_SET);
         if (read_atom(s, &atom) < 0)
             av_log(s, AV_LOG_ERROR, "error reading 'rdvo' atom\n");
         if (atom.tag == MKTAG('R','D','V','O')) {
             if (r3d_read_rdvo(s, &atom) < 0)
                 av_log(s, AV_LOG_ERROR, "error parsing 'rdvo' atom\n");
         }
     }

  out:
     avio_seek(s->pb, s->internal->data_offset, SEEK_SET);
     return 0;
 }

 static int r3d_read_redv(AVFormatContext *s, AVPacket *pkt, Atom *atom)
 {
     AVStream *st = s->streams[0];
     int tmp;
     int av_unused tmp2;
     int64_t pos = avio_tell(s->pb);
     unsigned dts;
     int ret;

     dts = avio_rb32(s->pb);

     tmp = avio_rb32(s->pb);
     av_log(s, AV_LOG_TRACE, "frame num %d\n", tmp);

     tmp  = avio_r8(s->pb); // major version
     tmp2 = avio_r8(s->pb); // minor version
     av_log(s, AV_LOG_TRACE, "version %d.%d\n", tmp, tmp2);

     tmp = avio_rb16(s->pb); // unknown
     av_log(s, AV_LOG_TRACE, "unknown %d\n", tmp);

     if (tmp > 4) {
         tmp = avio_rb16(s->pb); // unknown
         av_log(s, AV_LOG_TRACE, "unknown %d\n", tmp);

         tmp = avio_rb16(s->pb); // unknown
         av_log(s, AV_LOG_TRACE, "unknown %d\n", tmp);

         tmp = avio_rb32(s->pb);
         av_log(s, AV_LOG_TRACE, "width %d\n", tmp);
         tmp = avio_rb32(s->pb);
         av_log(s, AV_LOG_TRACE, "height %d\n", tmp);

         tmp = avio_rb32(s->pb);
         av_log(s, AV_LOG_TRACE, "metadata len %d\n", tmp);
     }
     tmp = atom->size - 8 - (avio_tell(s->pb) - pos);
     if (tmp < 0)
         return -1;
     ret = av_get_packet(s->pb, pkt, tmp);
     if (ret < 0) {
         av_log(s, AV_LOG_ERROR, "error reading video packet\n");
         return -1;
     }

     pkt->stream_index = 0;
     pkt->dts = dts;
     if (st->avg_frame_rate.num)
         pkt->duration = (uint64_t)st->time_base.den*
             st->avg_frame_rate.den/st->avg_frame_rate.num;
     av_log(s, AV_LOG_TRACE, "pkt dts %"PRId64" duration %"PRId64"\n", pkt->dts, pkt->duration);

     return 0;
 }

 static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)
 {
     R3DContext *r3d = s->priv_data;
     AVStream *st;
     int av_unused tmp, tmp2;
     int samples, size;
     int64_t pos = avio_tell(s->pb);
     unsigned dts;
     int ret;

     if (s->nb_streams < 2) {
         st = avformat_new_stream(s, NULL);
         if (!st)
             return AVERROR(ENOMEM);
         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
         st->codec->codec_id = AV_CODEC_ID_PCM_S32BE;
         st->codec->channels = r3d->audio_channels;
         avpriv_set_pts_info(st, 32, 1, s->streams[0]->time_base.den);
     } else {
         st = s->streams[1];
     }

     dts = avio_rb32(s->pb);

     st->codec->sample_rate = avio_rb32(s->pb);
     if (st->codec->sample_rate <= 0) {
         av_log(s, AV_LOG_ERROR, "Bad sample rate\n");
         return AVERROR_INVALIDDATA;
     }

     samples = avio_rb32(s->pb);

     tmp = avio_rb32(s->pb);
     av_log(s, AV_LOG_TRACE, "packet num %d\n", tmp);

     tmp = avio_rb16(s->pb); // unknown
     av_log(s, AV_LOG_TRACE, "unknown %d\n", tmp);

     tmp  = avio_r8(s->pb); // major version
     tmp2 = avio_r8(s->pb); // minor version
     av_log(s, AV_LOG_TRACE, "version %d.%d\n", tmp, tmp2);

     tmp = avio_rb32(s->pb); // unknown
     av_log(s, AV_LOG_TRACE, "unknown %d\n", tmp);

     size = atom->size - 8 - (avio_tell(s->pb) - pos);
     if (size < 0)
         return -1;
     ret = av_get_packet(s->pb, pkt, size);
     if (ret < 0) {
         av_log(s, AV_LOG_ERROR, "error reading audio packet\n");
         return ret;
     }

     pkt->stream_index = 1;
     pkt->dts = dts;
     if (st->codec->sample_rate)
         pkt->duration = av_rescale(samples, st->time_base.den, st->codec->sample_rate);
     av_log(s, AV_LOG_TRACE, "pkt dts %"PRId64" duration %"PRId64" samples %d sample rate %d\n",
             pkt->dts, pkt->duration, samples, st->codec->sample_rate);

     return 0;
 }

 static int r3d_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     R3DContext *r3d = s->priv_data;
     Atom atom;
     int err = 0;

     while (!err) {
         if (read_atom(s, &atom) < 0) {
             err = -1;
             break;
         }
         switch (atom.tag) {
         case MKTAG('R','E','D','V'):
             if (s->streams[0]->discard == AVDISCARD_ALL)
                 goto skip;
             if (!(err = r3d_read_redv(s, pkt, &atom)))
                 return 0;
             break;
         case MKTAG('R','E','D','A'):
             if (!r3d->audio_channels)
                 return -1;
             if (s->nb_streams >= 2 && s->streams[1]->discard == AVDISCARD_ALL)
                 goto skip;
             if (!(err = r3d_read_reda(s, pkt, &atom)))
                 return 0;
             break;
         default:
         skip:
             avio_skip(s->pb, atom.size-8);
         }
     }
     return err;
 }

 static int r3d_probe(AVProbeData *p)
 {
     if (AV_RL32(p->buf + 4) == MKTAG('R','E','D','1'))
         return AVPROBE_SCORE_MAX;
     return 0;
 }

 static int r3d_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
 {
     AVStream *st = s->streams[0]; // video stream
     R3DContext *r3d = s->priv_data;
     int frame_num;

     if (!st->avg_frame_rate.num)
         return -1;

     frame_num = av_rescale_q(sample_time, st->time_base,
                              av_inv_q(st->avg_frame_rate));
     av_log(s, AV_LOG_TRACE, "seek frame num %d timestamp %"PRId64"\n",
             frame_num, sample_time);

     if (frame_num < r3d->video_offsets_count) {
         if (avio_seek(s->pb, r3d->video_offsets_count, SEEK_SET) < 0)
             return -1;
     } else {
         av_log(s, AV_LOG_ERROR, "could not seek to frame %d\n", frame_num);
         return -1;
     }

     return 0;
 }

 static int r3d_close(AVFormatContext *s)
 {
     R3DContext *r3d = s->priv_data;

     av_freep(&r3d->video_offsets);

     return 0;
 }

 AVInputFormat ff_r3d_demuxer = {
     .name           = "r3d",
     .long_name      = NULL_IF_CONFIG_SMALL("REDCODE R3D"),
     .priv_data_size = sizeof(R3DContext),
     .read_probe     = r3d_probe,
     .read_header    = r3d_read_header,
     .read_packet    = r3d_read_packet,
     .read_close     = r3d_close,
     .read_seek      = r3d_seek,
 };
	/*
	* R3D REDCODE demuxer
	* Copyright (c) 2008 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
	*
	* 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 "libavutil/dict.h"
	#include "libavutil/mathematics.h"
	#include "avformat.h"
	#include "internal.h"

	typedef struct R3DContext {
	unsigned video_offsets_count;
	unsigned *video_offsets;
	unsigned rdvo_offset;

	int audio_channels;
	} R3DContext;

	typedef struct Atom {
	unsigned size;
	uint32_t tag;
	uint64_t offset;
	} Atom;

	static int read_atom(AVFormatContext s, Atom atom)
	{
	atom->offset = avio_tell(s->pb);
	atom->size = avio_rb32(s->pb);
	if (atom->size < 8)
	return -1;
	atom->tag = avio_rl32(s->pb);
	av_log(s, AV_LOG_TRACE, "atom %u %.4s offset %#"PRIx64"\n",
	atom->size, (char*)&atom->tag, atom->offset);
	return atom->size;
	}

	static int r3d_read_red1(AVFormatContext *s)
	{
	AVStream *st = avformat_new_stream(s, NULL);
	R3DContext *r3d = s->priv_data;
	char filename[258];
	int tmp;
	int av_unused tmp2;
	AVRational framerate;

	if (!st)
	return AVERROR(ENOMEM);
	st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
	st->codec->codec_id = AV_CODEC_ID_JPEG2000;

	tmp = avio_r8(s->pb); // major version
	tmp2 = avio_r8(s->pb); // minor version
	av_log(s, AV_LOG_TRACE, "version %d.%d\n", tmp, tmp2);

	tmp = avio_rb16(s->pb); // unknown
	av_log(s, AV_LOG_TRACE, "unknown1 %d\n", tmp);

	tmp = avio_rb32(s->pb);
	avpriv_set_pts_info(st, 32, 1, tmp);

	tmp = avio_rb32(s->pb); // filenum
	av_log(s, AV_LOG_TRACE, "filenum %d\n", tmp);

	avio_skip(s->pb, 32); // unknown

	st->codec->width = avio_rb32(s->pb);
	st->codec->height = avio_rb32(s->pb);

	tmp = avio_rb16(s->pb); // unknown
	av_log(s, AV_LOG_TRACE, "unknown2 %d\n", tmp);

	framerate.num = avio_rb16(s->pb);
	framerate.den = avio_rb16(s->pb);
	if (framerate.num > 0 && framerate.den > 0) {
	#if FF_API_R_FRAME_RATE
	st->r_frame_rate =
	#endif
	st->avg_frame_rate = framerate;
	}

	r3d->audio_channels = avio_r8(s->pb); // audio channels
	av_log(s, AV_LOG_TRACE, "audio channels %d\n", tmp);

	avio_read(s->pb, filename, 257);
	filename[sizeof(filename)-1] = 0;
	av_dict_set(&st->metadata, "filename", filename, 0);

	av_log(s, AV_LOG_TRACE, "filename %s\n", filename);
	av_log(s, AV_LOG_TRACE, "resolution %dx%d\n", st->codec->width, st->codec->height);
	av_log(s, AV_LOG_TRACE, "timescale %d\n", st->time_base.den);
	av_log(s, AV_LOG_TRACE, "frame rate %d/%d\n",
	framerate.num, framerate.den);

	return 0;
	}

	static int r3d_read_rdvo(AVFormatContext s, Atom atom)
	{
	R3DContext *r3d = s->priv_data;
	AVStream *st = s->streams[0];
	int i;

	r3d->video_offsets_count = (atom->size - 8) / 4;
	r3d->video_offsets = av_malloc(atom->size);
	if (!r3d->video_offsets)
	return AVERROR(ENOMEM);

	for (i = 0; i < r3d->video_offsets_count; i++) {
	r3d->video_offsets[i] = avio_rb32(s->pb);
	if (!r3d->video_offsets[i]) {
	r3d->video_offsets_count = i;
	break;
	}
	av_log(s, AV_LOG_TRACE, "video offset %d: %#x\n", i, r3d->video_offsets[i]);
	}

	if (st->avg_frame_rate.num)
	st->duration = av_rescale_q(r3d->video_offsets_count,
	av_inv_q(st->avg_frame_rate),
	st->time_base);
	av_log(s, AV_LOG_TRACE, "duration %"PRId64"\n", st->duration);

	return 0;
	}

	static void r3d_read_reos(AVFormatContext *s)
	{
	R3DContext *r3d = s->priv_data;
	int av_unused tmp;

	r3d->rdvo_offset = avio_rb32(s->pb);
	avio_rb32(s->pb); // rdvs offset
	avio_rb32(s->pb); // rdao offset
	avio_rb32(s->pb); // rdas offset

	tmp = avio_rb32(s->pb);
	av_log(s, AV_LOG_TRACE, "num video chunks %d\n", tmp);

	tmp = avio_rb32(s->pb);
	av_log(s, AV_LOG_TRACE, "num audio chunks %d\n", tmp);

	avio_skip(s->pb, 6*4);
	}

	static int r3d_read_header(AVFormatContext *s)
	{
	R3DContext *r3d = s->priv_data;
	Atom atom;
	int ret;

	if (read_atom(s, &atom) < 0) {
	av_log(s, AV_LOG_ERROR, "error reading atom\n");
	return -1;
	}
	if (atom.tag == MKTAG('R','E','D','1')) {
	if ((ret = r3d_read_red1(s)) < 0) {
	av_log(s, AV_LOG_ERROR, "error parsing 'red1' atom\n");
	return ret;
	}
	} else {
	av_log(s, AV_LOG_ERROR, "could not find 'red1' atom\n");
	return -1;
	}

	/* we cannot create the audio stream now because we do not know the
	* sample rate */
	if (r3d->audio_channels)
	s->ctx_flags \|= AVFMTCTX_NOHEADER;

	s->internal->data_offset = avio_tell(s->pb);
	av_log(s, AV_LOG_TRACE, "data offset %#"PRIx64"\n", s->internal->data_offset);
	if (!s->pb->seekable)
	return 0;
	// find REOB/REOF/REOS to load index
	avio_seek(s->pb, avio_size(s->pb)-48-8, SEEK_SET);
	if (read_atom(s, &atom) < 0)
	av_log(s, AV_LOG_ERROR, "error reading end atom\n");

	if (atom.tag != MKTAG('R','E','O','B') &&
	atom.tag != MKTAG('R','E','O','F') &&
	atom.tag != MKTAG('R','E','O','S'))
	goto out;

	r3d_read_reos(s);

	if (r3d->rdvo_offset) {
	avio_seek(s->pb, r3d->rdvo_offset, SEEK_SET);
	if (read_atom(s, &atom) < 0)
	av_log(s, AV_LOG_ERROR, "error reading 'rdvo' atom\n");
	if (atom.tag == MKTAG('R','D','V','O')) {
	if (r3d_read_rdvo(s, &atom) < 0)
	av_log(s, AV_LOG_ERROR, "error parsing 'rdvo' atom\n");
	}
	}

	out:
	avio_seek(s->pb, s->internal->data_offset, SEEK_SET);
	return 0;
	}

	static int r3d_read_redv(AVFormatContext s, AVPacket pkt, Atom *atom)
	{
	AVStream *st = s->streams[0];
	int tmp;
	int av_unused tmp2;
	int64_t pos = avio_tell(s->pb);
	unsigned dts;
	int ret;

	dts = avio_rb32(s->pb);

	tmp = avio_rb32(s->pb);
	av_log(s, AV_LOG_TRACE, "frame num %d\n", tmp);

	tmp = avio_r8(s->pb); // major version
	tmp2 = avio_r8(s->pb); // minor version
	av_log(s, AV_LOG_TRACE, "version %d.%d\n", tmp, tmp2);

	tmp = avio_rb16(s->pb); // unknown
	av_log(s, AV_LOG_TRACE, "unknown %d\n", tmp);

	if (tmp > 4) {
	tmp = avio_rb16(s->pb); // unknown
	av_log(s, AV_LOG_TRACE, "unknown %d\n", tmp);

	tmp = avio_rb16(s->pb); // unknown
	av_log(s, AV_LOG_TRACE, "unknown %d\n", tmp);

	tmp = avio_rb32(s->pb);
	av_log(s, AV_LOG_TRACE, "width %d\n", tmp);
	tmp = avio_rb32(s->pb);
	av_log(s, AV_LOG_TRACE, "height %d\n", tmp);

	tmp = avio_rb32(s->pb);
	av_log(s, AV_LOG_TRACE, "metadata len %d\n", tmp);
	}
	tmp = atom->size - 8 - (avio_tell(s->pb) - pos);
	if (tmp < 0)
	return -1;
	ret = av_get_packet(s->pb, pkt, tmp);
	if (ret < 0) {
	av_log(s, AV_LOG_ERROR, "error reading video packet\n");
	return -1;
	}

	pkt->stream_index = 0;
	pkt->dts = dts;
	if (st->avg_frame_rate.num)
	pkt->duration = (uint64_t)st->time_base.den*
	st->avg_frame_rate.den/st->avg_frame_rate.num;
	av_log(s, AV_LOG_TRACE, "pkt dts %"PRId64" duration %"PRId64"\n", pkt->dts, pkt->duration);

	return 0;
	}

	static int r3d_read_reda(AVFormatContext s, AVPacket pkt, Atom *atom)
	{
	R3DContext *r3d = s->priv_data;
	AVStream *st;
	int av_unused tmp, tmp2;
	int samples, size;
	int64_t pos = avio_tell(s->pb);
	unsigned dts;
	int ret;

	if (s->nb_streams < 2) {
	st = avformat_new_stream(s, NULL);
	if (!st)
	return AVERROR(ENOMEM);
	st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
	st->codec->codec_id = AV_CODEC_ID_PCM_S32BE;
	st->codec->channels = r3d->audio_channels;
	avpriv_set_pts_info(st, 32, 1, s->streams[0]->time_base.den);
	} else {
	st = s->streams[1];
	}

	dts = avio_rb32(s->pb);

	st->codec->sample_rate = avio_rb32(s->pb);
	if (st->codec->sample_rate <= 0) {
	av_log(s, AV_LOG_ERROR, "Bad sample rate\n");
	return AVERROR_INVALIDDATA;
	}

	samples = avio_rb32(s->pb);

	tmp = avio_rb32(s->pb);
	av_log(s, AV_LOG_TRACE, "packet num %d\n", tmp);

	tmp = avio_rb16(s->pb); // unknown
	av_log(s, AV_LOG_TRACE, "unknown %d\n", tmp);

	tmp = avio_r8(s->pb); // major version
	tmp2 = avio_r8(s->pb); // minor version
	av_log(s, AV_LOG_TRACE, "version %d.%d\n", tmp, tmp2);

	tmp = avio_rb32(s->pb); // unknown
	av_log(s, AV_LOG_TRACE, "unknown %d\n", tmp);

	size = atom->size - 8 - (avio_tell(s->pb) - pos);
	if (size < 0)
	return -1;
	ret = av_get_packet(s->pb, pkt, size);
	if (ret < 0) {
	av_log(s, AV_LOG_ERROR, "error reading audio packet\n");
	return ret;
	}

	pkt->stream_index = 1;
	pkt->dts = dts;
	if (st->codec->sample_rate)
	pkt->duration = av_rescale(samples, st->time_base.den, st->codec->sample_rate);
	av_log(s, AV_LOG_TRACE, "pkt dts %"PRId64" duration %"PRId64" samples %d sample rate %d\n",
	pkt->dts, pkt->duration, samples, st->codec->sample_rate);

	return 0;
	}

	static int r3d_read_packet(AVFormatContext s, AVPacket pkt)
	{
	R3DContext *r3d = s->priv_data;
	Atom atom;
	int err = 0;

	while (!err) {
	if (read_atom(s, &atom) < 0) {
	err = -1;
	break;
	}
	switch (atom.tag) {
	case MKTAG('R','E','D','V'):
	if (s->streams[0]->discard == AVDISCARD_ALL)
	goto skip;
	if (!(err = r3d_read_redv(s, pkt, &atom)))
	return 0;
	break;
	case MKTAG('R','E','D','A'):
	if (!r3d->audio_channels)
	return -1;
	if (s->nb_streams >= 2 && s->streams[1]->discard == AVDISCARD_ALL)
	goto skip;
	if (!(err = r3d_read_reda(s, pkt, &atom)))
	return 0;
	break;
	default:
	skip:
	avio_skip(s->pb, atom.size-8);
	}
	}
	return err;
	}

	static int r3d_probe(AVProbeData *p)
	{
	if (AV_RL32(p->buf + 4) == MKTAG('R','E','D','1'))
	return AVPROBE_SCORE_MAX;
	return 0;
	}

	static int r3d_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
	{
	AVStream *st = s->streams[0]; // video stream
	R3DContext *r3d = s->priv_data;
	int frame_num;

	if (!st->avg_frame_rate.num)
	return -1;

	frame_num = av_rescale_q(sample_time, st->time_base,
	av_inv_q(st->avg_frame_rate));
	av_log(s, AV_LOG_TRACE, "seek frame num %d timestamp %"PRId64"\n",
	frame_num, sample_time);

	if (frame_num < r3d->video_offsets_count) {
	if (avio_seek(s->pb, r3d->video_offsets_count, SEEK_SET) < 0)
	return -1;
	} else {
	av_log(s, AV_LOG_ERROR, "could not seek to frame %d\n", frame_num);
	return -1;
	}

	return 0;
	}

	static int r3d_close(AVFormatContext *s)
	{
	R3DContext *r3d = s->priv_data;

	av_freep(&r3d->video_offsets);

	return 0;
	}

	AVInputFormat ff_r3d_demuxer = {
	.name = "r3d",
	.long_name = NULL_IF_CONFIG_SMALL("REDCODE R3D"),
	.priv_data_size = sizeof(R3DContext),
	.read_probe = r3d_probe,
	.read_header = r3d_read_header,
	.read_packet = r3d_read_packet,
	.read_close = r3d_close,
	.read_seek = r3d_seek,
	};