Permalink
Find file
Fetching contributors…
Cannot retrieve contributors at this time
325 lines (264 sloc) 9.73 KB
/*
* NUT (de)muxing via libnut
* copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
*
* 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
*/
/**
* @file
* NUT demuxing and muxing via libnut.
* @author Oded Shimon <ods15@ods15.dyndns.org>
*/
#include "avformat.h"
#include "internal.h"
#include "riff.h"
#include <libnut.h>
#define ID_STRING "nut/multimedia container"
#define ID_LENGTH (strlen(ID_STRING) + 1)
typedef struct {
nut_context_tt * nut;
nut_stream_header_tt * s;
} NUTContext;
static const AVCodecTag nut_tags[] = {
{ AV_CODEC_ID_MPEG4, MKTAG('m', 'p', '4', 'v') },
{ AV_CODEC_ID_MP3, MKTAG('m', 'p', '3', ' ') },
{ AV_CODEC_ID_VORBIS, MKTAG('v', 'r', 'b', 's') },
{ 0, 0 },
};
#if CONFIG_LIBNUT_MUXER
static int av_write(void * h, size_t len, const uint8_t * buf) {
AVIOContext * bc = h;
avio_write(bc, buf, len);
//avio_flush(bc);
return len;
}
static int nut_write_header(AVFormatContext * avf) {
NUTContext * priv = avf->priv_data;
AVIOContext * bc = avf->pb;
nut_muxer_opts_tt mopts = {
.output = {
.priv = bc,
.write = av_write,
},
.alloc = { av_malloc, av_realloc, av_free },
.write_index = 1,
.realtime_stream = 0,
.max_distance = 32768,
.fti = NULL,
};
nut_stream_header_tt * s;
int i;
priv->s = s = av_mallocz_array(avf->nb_streams + 1, sizeof*s);
if(!s)
return AVERROR(ENOMEM);
for (i = 0; i < avf->nb_streams; i++) {
AVCodecContext * codec = avf->streams[i]->codec;
int j;
int fourcc = 0;
int num, denom, ssize;
s[i].type = codec->codec_type == AVMEDIA_TYPE_VIDEO ? NUT_VIDEO_CLASS : NUT_AUDIO_CLASS;
if (codec->codec_tag) fourcc = codec->codec_tag;
else fourcc = ff_codec_get_tag(nut_tags, codec->codec_id);
if (!fourcc) {
if (codec->codec_type == AVMEDIA_TYPE_VIDEO) fourcc = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
if (codec->codec_type == AVMEDIA_TYPE_AUDIO) fourcc = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
}
s[i].fourcc_len = 4;
s[i].fourcc = av_malloc(s[i].fourcc_len);
for (j = 0; j < s[i].fourcc_len; j++) s[i].fourcc[j] = (fourcc >> (j*8)) & 0xFF;
ff_parse_specific_params(codec, &num, &ssize, &denom);
avpriv_set_pts_info(avf->streams[i], 60, denom, num);
s[i].time_base.num = denom;
s[i].time_base.den = num;
s[i].fixed_fps = 0;
s[i].decode_delay = codec->has_b_frames;
s[i].codec_specific_len = codec->extradata_size;
s[i].codec_specific = codec->extradata;
if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
s[i].width = codec->width;
s[i].height = codec->height;
s[i].sample_width = 0;
s[i].sample_height = 0;
s[i].colorspace_type = 0;
} else {
s[i].samplerate_num = codec->sample_rate;
s[i].samplerate_denom = 1;
s[i].channel_count = codec->channels;
}
}
s[avf->nb_streams].type = -1;
priv->nut = nut_muxer_init(&mopts, s, NULL);
return 0;
}
static int nut_write_packet(AVFormatContext * avf, AVPacket * pkt) {
NUTContext * priv = avf->priv_data;
nut_packet_tt p;
p.len = pkt->size;
p.stream = pkt->stream_index;
p.pts = pkt->pts;
p.flags = pkt->flags & AV_PKT_FLAG_KEY ? NUT_FLAG_KEY : 0;
p.next_pts = 0;
nut_write_frame_reorder(priv->nut, &p, pkt->data);
return 0;
}
static int nut_write_trailer(AVFormatContext * avf) {
AVIOContext * bc = avf->pb;
NUTContext * priv = avf->priv_data;
int i;
nut_muxer_uninit_reorder(priv->nut);
avio_flush(bc);
for(i = 0; priv->s[i].type != -1; i++ ) av_freep(&priv->s[i].fourcc);
av_freep(&priv->s);
return 0;
}
AVOutputFormat ff_libnut_muxer = {
.name = "libnut",
.long_name = "nut format",
.mime_type = "video/x-nut",
.extensions = "nut",
.priv_data_size = sizeof(NUTContext),
.audio_codec = AV_CODEC_ID_VORBIS,
.video_codec = AV_CODEC_ID_MPEG4,
.write_header = nut_write_header,
.write_packet = nut_write_packet,
.write_trailer = nut_write_trailer,
.flags = AVFMT_GLOBALHEADER,
};
#endif /* CONFIG_LIBNUT_MUXER */
static int nut_probe(AVProbeData *p) {
if (!memcmp(p->buf, ID_STRING, ID_LENGTH)) return AVPROBE_SCORE_MAX;
return 0;
}
static size_t av_read(void * h, size_t len, uint8_t * buf) {
AVIOContext * bc = h;
return avio_read(bc, buf, len);
}
static off_t av_seek(void * h, int64_t pos, int whence) {
AVIOContext * bc = h;
if (whence == SEEK_END) {
pos = avio_size(bc) + pos;
whence = SEEK_SET;
}
return avio_seek(bc, pos, whence);
}
static int nut_read_header(AVFormatContext * avf) {
NUTContext * priv = avf->priv_data;
AVIOContext * bc = avf->pb;
nut_demuxer_opts_tt dopts = {
.input = {
.priv = bc,
.seek = av_seek,
.read = av_read,
.eof = NULL,
.file_pos = 0,
},
.alloc = { av_malloc, av_realloc, av_free },
.read_index = 1,
.cache_syncpoints = 1,
};
nut_context_tt * nut = priv->nut = nut_demuxer_init(&dopts);
nut_stream_header_tt * s;
int ret, i;
if(!nut)
return -1;
if ((ret = nut_read_headers(nut, &s, NULL))) {
av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret));
nut_demuxer_uninit(nut);
priv->nut = NULL;
return -1;
}
priv->s = s;
for (i = 0; s[i].type != -1 && i < 2; i++) {
AVStream * st = avformat_new_stream(avf, NULL);
int j;
if (!st)
return AVERROR(ENOMEM);
for (j = 0; j < s[i].fourcc_len && j < 8; j++) st->codec->codec_tag |= s[i].fourcc[j]<<(j*8);
st->codec->has_b_frames = s[i].decode_delay;
st->codec->extradata_size = s[i].codec_specific_len;
if (st->codec->extradata_size) {
if(ff_alloc_extradata(st->codec, st->codec->extradata_size)){
nut_demuxer_uninit(nut);
priv->nut = NULL;
return AVERROR(ENOMEM);
}
memcpy(st->codec->extradata, s[i].codec_specific, st->codec->extradata_size);
}
avpriv_set_pts_info(avf->streams[i], 60, s[i].time_base.num, s[i].time_base.den);
st->start_time = 0;
st->duration = s[i].max_pts;
st->codec->codec_id = ff_codec_get_id(nut_tags, st->codec->codec_tag);
switch(s[i].type) {
case NUT_AUDIO_CLASS:
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
if (st->codec->codec_id == AV_CODEC_ID_NONE) st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, st->codec->codec_tag);
st->codec->channels = s[i].channel_count;
st->codec->sample_rate = s[i].samplerate_num / s[i].samplerate_denom;
break;
case NUT_VIDEO_CLASS:
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
if (st->codec->codec_id == AV_CODEC_ID_NONE) st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, st->codec->codec_tag);
st->codec->width = s[i].width;
st->codec->height = s[i].height;
st->sample_aspect_ratio.num = s[i].sample_width;
st->sample_aspect_ratio.den = s[i].sample_height;
break;
}
if (st->codec->codec_id == AV_CODEC_ID_NONE) av_log(avf, AV_LOG_ERROR, "Unknown codec?!\n");
}
return 0;
}
static int nut_read_packet(AVFormatContext * avf, AVPacket * pkt) {
NUTContext * priv = avf->priv_data;
nut_packet_tt pd;
int ret;
ret = nut_read_next_packet(priv->nut, &pd);
if (ret || av_new_packet(pkt, pd.len) < 0) {
if (ret != NUT_ERR_EOF)
av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret));
return -1;
}
if (pd.flags & NUT_FLAG_KEY) pkt->flags |= AV_PKT_FLAG_KEY;
pkt->pts = pd.pts;
pkt->stream_index = pd.stream;
pkt->pos = avio_tell(avf->pb);
ret = nut_read_frame(priv->nut, &pd.len, pkt->data);
return ret;
}
static int nut_read_seek(AVFormatContext * avf, int stream_index, int64_t target_ts, int flags) {
NUTContext * priv = avf->priv_data;
int active_streams[] = { stream_index, -1 };
double time_pos = target_ts * priv->s[stream_index].time_base.num / (double)priv->s[stream_index].time_base.den;
if (nut_seek(priv->nut, time_pos, 2*!(flags & AVSEEK_FLAG_BACKWARD), active_streams)) return -1;
return 0;
}
static int nut_read_close(AVFormatContext *s) {
NUTContext * priv = s->priv_data;
nut_demuxer_uninit(priv->nut);
return 0;
}
AVInputFormat ff_libnut_demuxer = {
.name = "libnut",
.long_name = NULL_IF_CONFIG_SMALL("NUT format"),
.priv_data_size = sizeof(NUTContext),
.read_probe = nut_probe,
.read_header = nut_read_header,
.read_packet = nut_read_packet,
.read_close = nut_read_close,
.read_seek = nut_read_seek,
.extensions = "nut",
};