From 96319c3922af2252500552ba5ffff6b7cc4f29c1 Mon Sep 17 00:00:00 2001 From: Roman Shaposhnik Date: Mon, 27 Sep 2004 22:46:36 +0000 Subject: * let DV muxer generate audioless DV streams. This might not be 100% complaint with the SMPTE & IEC specs, but it seems harmless enough. The way we "specify" that there's no audio is by simply leaving audio DIFs filled with 0xff (I bet there's a way to mark this properly in the system info section!). Originally committed as revision 3526 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/dv.c | 64 +++++++++++++++++++++++++++++++------------------------- 1 file changed, 36 insertions(+), 28 deletions(-) (limited to 'libavformat/dv.c') diff --git a/libavformat/dv.c b/libavformat/dv.c index 9606bae65b..a5ac8c86bd 100644 --- a/libavformat/dv.c +++ b/libavformat/dv.c @@ -377,9 +377,9 @@ static void dv_format_frame(DVMuxContext *c, uint8_t* buf) /* DV Audio/Video: 135 Video DIFs + 9 Audio DIFs */ for (j = 0; j < 135; j++) { if (j%15 == 0) { + memset(buf, 0xff, 80); buf += dv_write_dif_id(dv_sect_audio, i, j/15, buf); - buf += dv_write_pack(dv_aaux_packs_dist[i][j/15], c, buf); - buf += 72; /* shuffled PCM audio */ + buf += 77; /* audio control & shuffled PCM audio */ } buf += dv_write_dif_id(dv_sect_video, i, j, buf); buf += 77; /* 1 video macro block: 1 bytes control @@ -397,6 +397,7 @@ static void dv_inject_audio(DVMuxContext *c, const uint8_t* pcm, uint8_t* frame_ for (i = 0; i < c->sys->difseg_size; i++) { frame_ptr += 6 * 80; /* skip DIF segment header */ for (j = 0; j < 9; j++) { + dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3]); for (d = 8; d < 80; d+=2) { of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride; if (of*2 >= size) @@ -614,7 +615,9 @@ int dv_assemble_frame(DVMuxContext *c, AVStream* st, if (c->has_audio && c->has_video) { /* must be a stale frame */ dv_format_frame(c, *frame); c->frames++; - c->has_audio = c->has_video = 0; + if (c->has_audio > 0) + c->has_audio = 0; + c->has_video = 0; } if (st->codec.codec_type == CODEC_TYPE_VIDEO) { @@ -625,6 +628,8 @@ int dv_assemble_frame(DVMuxContext *c, AVStream* st, dv_inject_video(c, data, *frame); c->has_video = 1; data_size = 0; + if (c->has_audio < 0) + goto out; } reqasize = 4 * dv_audio_frame_size(c->sys, c->frames); @@ -649,56 +654,59 @@ int dv_assemble_frame(DVMuxContext *c, AVStream* st, fifo_write(&c->audio_data, (uint8_t *)data, data_size, &c->audio_data.wptr); } +out: return (c->has_audio && c->has_video) ? c->sys->frame_size : 0; } DVMuxContext* dv_init_mux(AVFormatContext* s) { DVMuxContext *c; - AVStream *vst; - AVStream *ast; + AVStream *vst = NULL; + AVStream *ast = NULL; + int i; + + if (s->nb_streams > 2) + return NULL; c = av_mallocz(sizeof(DVMuxContext)); if (!c) return NULL; - if (s->nb_streams != 2) - goto bail_out; - /* We have to sort out where audio and where video stream is */ - if (s->streams[0]->codec.codec_type == CODEC_TYPE_VIDEO && - s->streams[1]->codec.codec_type == CODEC_TYPE_AUDIO) { - vst = s->streams[0]; - ast = s->streams[1]; + for (i=0; inb_streams; i++) { + switch (s->streams[i]->codec.codec_type) { + case CODEC_TYPE_VIDEO: + vst = s->streams[i]; + break; + case CODEC_TYPE_AUDIO: + ast = s->streams[i]; + break; + default: + goto bail_out; + } } - else if (s->streams[1]->codec.codec_type == CODEC_TYPE_VIDEO && - s->streams[0]->codec.codec_type == CODEC_TYPE_AUDIO) { - vst = s->streams[1]; - ast = s->streams[0]; - } else - goto bail_out; - + /* Some checks -- DV format is very picky about its incoming streams */ - if (vst->codec.codec_id != CODEC_ID_DVVIDEO || - ast->codec.codec_id != CODEC_ID_PCM_S16LE) - goto bail_out; - if (ast->codec.sample_rate != 48000 || - ast->codec.channels != 2) - goto bail_out; - + if (!vst || vst->codec.codec_id != CODEC_ID_DVVIDEO) + goto bail_out; + if (ast && (ast->codec.codec_id != CODEC_ID_PCM_S16LE || + ast->codec.sample_rate != 48000 || + ast->codec.channels != 2)) + goto bail_out; c->sys = dv_codec_profile(&vst->codec); if (!c->sys) goto bail_out; /* Ok, everything seems to be in working order */ c->frames = 0; - c->has_audio = c->has_video = 0; + c->has_audio = ast ? 0 : -1; + c->has_video = 0; c->start_time = (time_t)s->timestamp; c->aspect = 0; /* 4:3 is the default */ if ((int)(av_q2d(vst->codec.sample_aspect_ratio) * vst->codec.width / vst->codec.height * 10) == 17) /* 16:9 */ c->aspect = 0x07; - if (fifo_init(&c->audio_data, 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0) + if (ast && fifo_init(&c->audio_data, 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0) goto bail_out; dv_format_frame(c, &c->frame_buf[0]); -- cgit v1.2.3