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/*
* NuppelVideo demuxer. |
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* Copyright (c) 2006 Reimar Doeffinger |
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* |
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* This file is part of FFmpeg.
*
* 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
* 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
* 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 |
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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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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "riff.h" |
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typedef struct {
int v_id;
int a_id; |
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int rtjpg_video; |
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} NUVContext;
typedef enum {
NUV_VIDEO = 'V',
NUV_EXTRADATA = 'D',
NUV_AUDIO = 'A',
NUV_SEEKP = 'R',
NUV_MYTHEXT = 'X' |
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} nuv_frametype; |
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static int nuv_probe(AVProbeData *p) {
if (!memcmp(p->buf, "NuppelVideo", 12))
return AVPROBE_SCORE_MAX;
if (!memcmp(p->buf, "MythTVVideo", 12))
return AVPROBE_SCORE_MAX;
return 0;
}
//! little macro to sanitize packet size
#define PKTSIZE(s) (s & 0xffffff)
/**
* \brief read until we found all data needed for decoding
* \param vst video stream of which to change parameters
* \param ast video stream of which to change parameters
* \param myth set if this is a MythTVVideo format file
* \return 1 if all required codec data was found
*/
static int get_codec_data(ByteIOContext *pb, AVStream *vst,
AVStream *ast, int myth) { |
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nuv_frametype frametype; |
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if (!vst && !myth)
return 1; // no codec data needed
while (!url_feof(pb)) {
int size, subtype;
frametype = get_byte(pb);
switch (frametype) {
case NUV_EXTRADATA:
subtype = get_byte(pb);
url_fskip(pb, 6);
size = PKTSIZE(get_le32(pb)); |
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if (vst && subtype == 'R') { |
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vst->codec->extradata_size = size;
vst->codec->extradata = av_malloc(size);
get_buffer(pb, vst->codec->extradata, size);
size = 0;
if (!myth)
return 1;
}
break;
case NUV_MYTHEXT:
url_fskip(pb, 7);
size = PKTSIZE(get_le32(pb));
if (size != 128 * 4)
break;
get_le32(pb); // version
if (vst) {
vst->codec->codec_tag = get_le32(pb);
vst->codec->codec_id =
codec_get_id(codec_bmp_tags, vst->codec->codec_tag); |
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if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
vst->codec->codec_id = CODEC_ID_NUV; |
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} else
url_fskip(pb, 4);
if (ast) {
ast->codec->codec_tag = get_le32(pb);
ast->codec->sample_rate = get_le32(pb); |
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ast->codec->bits_per_coded_sample = get_le32(pb); |
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ast->codec->channels = get_le32(pb);
ast->codec->codec_id =
wav_codec_get_id(ast->codec->codec_tag, |
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ast->codec->bits_per_coded_sample); |
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ast->need_parsing = AVSTREAM_PARSE_FULL; |
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} else
url_fskip(pb, 4 * 4);
size -= 6 * 4;
url_fskip(pb, size);
return 1;
case NUV_SEEKP:
size = 11;
break;
default:
url_fskip(pb, 7);
size = PKTSIZE(get_le32(pb));
break;
}
url_fskip(pb, size);
}
return 0;
}
static int nuv_header(AVFormatContext *s, AVFormatParameters *ap) { |
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NUVContext *ctx = s->priv_data; |
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ByteIOContext *pb = s->pb; |
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char id_string[12], version_string[5];
double aspect, fps;
int is_mythtv, width, height, v_packs, a_packs;
int stream_nr = 0;
AVStream *vst = NULL, *ast = NULL;
get_buffer(pb, id_string, 12);
is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
get_buffer(pb, version_string, 5);
url_fskip(pb, 3); // padding
width = get_le32(pb);
height = get_le32(pb);
get_le32(pb); // unused, "desiredwidth"
get_le32(pb); // unused, "desiredheight"
get_byte(pb); // 'P' == progressive, 'I' == interlaced
url_fskip(pb, 3); // padding
aspect = av_int2dbl(get_le64(pb)); |
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if (aspect > 0.9999 && aspect < 1.0001)
aspect = 4.0 / 3.0; |
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fps = av_int2dbl(get_le64(pb));
// number of packets per stream type, -1 means unknown, e.g. streaming
v_packs = get_le32(pb);
a_packs = get_le32(pb);
get_le32(pb); // text
get_le32(pb); // keyframe distance (?)
if (v_packs) {
ctx->v_id = stream_nr++;
vst = av_new_stream(s, ctx->v_id); |
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if (!vst)
return AVERROR(ENOMEM); |
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vst->codec->codec_type = CODEC_TYPE_VIDEO;
vst->codec->codec_id = CODEC_ID_NUV;
vst->codec->width = width;
vst->codec->height = height; |
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vst->codec->bits_per_coded_sample = 10; |
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vst->sample_aspect_ratio = av_d2q(aspect * height / width, 10000); |
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vst->r_frame_rate = av_d2q(fps, 60000); |
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av_set_pts_info(vst, 32, 1, 1000);
} else
ctx->v_id = -1;
if (a_packs) {
ctx->a_id = stream_nr++;
ast = av_new_stream(s, ctx->a_id); |
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if (!ast)
return AVERROR(ENOMEM); |
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ast->codec->codec_type = CODEC_TYPE_AUDIO;
ast->codec->codec_id = CODEC_ID_PCM_S16LE;
ast->codec->channels = 2;
ast->codec->sample_rate = 44100;
ast->codec->bit_rate = 2 * 2 * 44100 * 8;
ast->codec->block_align = 2 * 2; |
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ast->codec->bits_per_coded_sample = 16; |
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av_set_pts_info(ast, 32, 1, 1000);
} else
ctx->a_id = -1;
get_codec_data(pb, vst, ast, is_mythtv); |
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ctx->rtjpg_video = vst && vst->codec->codec_id == CODEC_ID_NUV; |
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return 0;
}
#define HDRSIZE 12
static int nuv_packet(AVFormatContext *s, AVPacket *pkt) { |
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NUVContext *ctx = s->priv_data; |
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ByteIOContext *pb = s->pb; |
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uint8_t hdr[HDRSIZE]; |
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nuv_frametype frametype; |
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int ret, size;
while (!url_feof(pb)) { |
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int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0; |
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ret = get_buffer(pb, hdr, HDRSIZE);
if (ret <= 0) |
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return ret ? ret : -1; |
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frametype = hdr[0]; |
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size = PKTSIZE(AV_RL32(&hdr[8])); |
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switch (frametype) {
case NUV_EXTRADATA: |
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if (!ctx->rtjpg_video) {
url_fskip(pb, size);
break;
}
case NUV_VIDEO: |
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if (ctx->v_id < 0) {
av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
url_fskip(pb, size);
break;
} |
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ret = av_new_packet(pkt, copyhdrsize + size); |
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if (ret < 0)
return ret; |
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pkt->pos = url_ftell(pb) - copyhdrsize; |
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pkt->pts = AV_RL32(&hdr[4]); |
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pkt->stream_index = ctx->v_id; |
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memcpy(pkt->data, hdr, copyhdrsize);
ret = get_buffer(pb, pkt->data + copyhdrsize, size); |
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return ret;
case NUV_AUDIO:
if (ctx->a_id < 0) {
av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
url_fskip(pb, size);
break;
}
ret = av_get_packet(pb, pkt, size); |
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pkt->pts = AV_RL32(&hdr[4]); |
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pkt->stream_index = ctx->a_id;
return ret;
case NUV_SEEKP:
// contains no data, size value is invalid
break;
default:
url_fskip(pb, size);
break;
}
} |
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return AVERROR(EIO); |
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}
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AVInputFormat nuv_demuxer = { |
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"nuv", |
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NULL_IF_CONFIG_SMALL("NuppelVideo format"), |
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sizeof(NUVContext),
nuv_probe,
nuv_header,
nuv_packet,
NULL,
NULL,
}; |