AVStream* vst;
AVStream* ast[2];
AVPacket audio_pkt[2];
+ uint8_t audio_buf[2][8192];
int ach;
int frames;
uint64_t abytes;
/* 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
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)
{
const uint8_t* as_pack;
const DVprofile* sys;
- int freq, smpls, quant, i;
+ int freq, smpls, quant, i, ach;
sys = dv_frame_profile(frame);
as_pack = dv_extract_pack(frame, dv_audio_source);
if (!as_pack || !sys) { /* No audio ? */
c->ach = 0;
- return -1;
+ return 0;
}
smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
- c->ach = (quant && freq == 2) ? 2 : 1;
-
- /* The second stereo channel could appear in IEC 61834 stream only */
- if (c->ach == 2 && !c->ast[1]) {
- c->ast[1] = av_new_stream(c->fctx, 0);
- if (c->ast[1]) {
- av_set_pts_info(c->ast[1], 64, 1, 30000);
- c->ast[1]->codec.codec_type = CODEC_TYPE_AUDIO;
- c->ast[1]->codec.codec_id = CODEC_ID_PCM_S16LE;
- } else
- c->ach = 1;
- }
- for (i=0; i<c->ach; i++) {
+ ach = (quant && freq == 2) ? 2 : 1;
+
+ /* Dynamic handling of the audio streams in DV */
+ for (i=0; i<ach; i++) {
+ if (!c->ast[i]) {
+ c->ast[i] = av_new_stream(c->fctx, 0);
+ if (!c->ast[i])
+ break;
+ av_set_pts_info(c->ast[i], 64, 1, 30000);
+ c->ast[i]->codec.codec_type = CODEC_TYPE_AUDIO;
+ c->ast[i]->codec.codec_id = CODEC_ID_PCM_S16LE;
+
+ av_init_packet(&c->audio_pkt[i]);
+ c->audio_pkt[i].size = 0;
+ c->audio_pkt[i].data = c->audio_buf[i];
+ c->audio_pkt[i].stream_index = c->ast[i]->index;
+ c->audio_pkt[i].flags |= PKT_FLAG_KEY;
+ }
c->ast[i]->codec.sample_rate = dv_audio_frequency[freq];
c->ast[i]->codec.channels = 2;
c->ast[i]->codec.bit_rate = 2 * dv_audio_frequency[freq] * 16;
+ c->ast[i]->start_time = 0;
}
+ c->ach = i;
return (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */;
}
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) {
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);
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; i<s->nb_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]);
return NULL;
c->vst = av_new_stream(s, 0);
- c->ast[0] = av_new_stream(s, 0);
- if (!c->vst || !c->ast[0])
- goto fail;
+ if (!c->vst) {
+ av_free(c);
+ return NULL;
+ }
av_set_pts_info(c->vst, 64, 1, 30000);
- av_set_pts_info(c->ast[0], 64, 1, 30000);
c->fctx = s;
- c->ast[1] = NULL;
+ c->ast[0] = c->ast[1] = NULL;
c->ach = 0;
c->frames = 0;
c->abytes = 0;
- c->audio_pkt[0].size = 0;
- c->audio_pkt[1].size = 0;
-
+
c->vst->codec.codec_type = CODEC_TYPE_VIDEO;
c->vst->codec.codec_id = CODEC_ID_DVVIDEO;
c->vst->codec.bit_rate = 25000000;
-
- c->ast[0]->codec.codec_type = CODEC_TYPE_AUDIO;
- c->ast[0]->codec.codec_id = CODEC_ID_PCM_S16LE;
-
- s->ctx_flags |= AVFMTCTX_NOHEADER;
+ c->vst->start_time = 0;
return c;
-
-fail:
- if (c->vst)
- av_free(c->vst);
- if (c->ast[0])
- av_free(c->ast[0]);
- av_free(c);
- return NULL;
-}
-
-static void __destruct_pkt(struct AVPacket *pkt)
-{
- pkt->data = NULL; pkt->size = 0;
- return;
}
int dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
/* Queueing audio packet */
/* FIXME: in case of no audio/bad audio we have to do something */
size = dv_extract_audio_info(c, buf);
- c->audio_pkt[0].data = c->audio_pkt[1].data = NULL;
for (i=0; i<c->ach; i++) {
- if (av_new_packet(&c->audio_pkt[i], size) < 0)
- return AVERROR_NOMEM;
- c->audio_pkt[i].stream_index = c->ast[i]->index;
- c->audio_pkt[i].pts = c->abytes * 30000*8 / c->ast[i]->codec.bit_rate;
- c->audio_pkt[i].flags |= PKT_FLAG_KEY;
+ c->audio_pkt[i].size = size;
+ c->audio_pkt[i].pts = c->abytes * 30000*8 / c->ast[i]->codec.bit_rate;
}
- dv_extract_audio(buf, c->audio_pkt[0].data, c->audio_pkt[1].data);
+ dv_extract_audio(buf, c->audio_buf[0], c->audio_buf[1]);
c->abytes += size;
/* Now it's time to return video packet */
size = dv_extract_video_info(c, buf);
av_init_packet(pkt);
- pkt->destruct = __destruct_pkt;
pkt->data = buf;
pkt->size = size;
pkt->flags |= PKT_FLAG_KEY;
return size;
}
-int64_t dv_frame_offset(DVDemuxContext *c, int64_t timestamp)
+static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c,
+ int64_t timestamp, int flags)
{
- const DVprofile* sys;
-
// FIXME: sys may be wrong if last dv_read_packet() failed (buffer is junk)
- sys = dv_codec_profile(&c->vst->codec);
-
- // timestamp was scaled by time_base/AV_BASE_RATE by av_seek_frame()
- int64_t frame_number = av_rescale(sys->frame_rate, timestamp,
- (int64_t) 30000 * sys->frame_rate_base);
+ const DVprofile* sys = dv_codec_profile(&c->vst->codec);
+ int64_t frame_number, offset;
+ int64_t size = url_filesize(url_fileno(&s->pb));
+ int64_t max_offset = ((size-1) / sys->frame_size) * sys->frame_size;
+
+ if (flags & AVSEEK_FLAG_BACKWARD) {
+ frame_number = av_rescale_rnd(timestamp, sys->frame_rate,
+ (int64_t) 30000 * sys->frame_rate_base,
+ AV_ROUND_DOWN);
+ }
+ else {
+ frame_number = av_rescale_rnd(timestamp, sys->frame_rate,
+ (int64_t) 30000 * sys->frame_rate_base,
+ AV_ROUND_UP);
+ }
- // offset must be a multiple of frame_size else dv_read_packet() will fail
- int64_t offset = (int64_t) sys->frame_size * frame_number;
+ offset = sys->frame_size * frame_number;
+
+ if (offset > max_offset) offset = max_offset;
+ else if (offset < 0) offset = 0;
return offset;
}
+void dv_flush_audio_packets(DVDemuxContext *c)
+{
+ c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
+}
+
/************************************************************
* Implementation of the easiest DV storage of all -- raw DV.
************************************************************/
AVFormatParameters *ap)
{
RawDVContext *c = s->priv_data;
+ const DVprofile* sys;
c->dv_demux = dv_init_demux(s);
+ if (!c->dv_demux)
+ return -1;
- return c->dv_demux ? 0 : -1;
+ if (get_buffer(&s->pb, c->buf, 4) <= 0 || url_fseek(&s->pb, -4, SEEK_CUR) < 0)
+ return AVERROR_IO;
+
+ sys = dv_frame_profile(c->buf);
+ s->bit_rate = av_rescale(sys->frame_size * 8, sys->frame_rate, sys->frame_rate_base);
+
+ return 0;
}
return size;
}
-static int dv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp)
+static int dv_read_seek(AVFormatContext *s, int stream_index,
+ int64_t timestamp, int flags)
{
- RawDVContext *c = s->priv_data;
-
- return url_fseek(&s->pb, dv_frame_offset(c->dv_demux, timestamp), SEEK_SET);
+ RawDVContext *r = s->priv_data;
+ DVDemuxContext *c = r->dv_demux;
+ int64_t offset= dv_frame_offset(s, c, timestamp, flags);
+ const DVprofile* sys = dv_codec_profile(&c->vst->codec);
+
+ c->frames= offset / sys->frame_size;
+ if (c->ach)
+ c->abytes= av_rescale(c->frames,
+ c->ast[0]->codec.bit_rate * (int64_t)sys->frame_rate_base,
+ 8*sys->frame_rate);
+
+ dv_flush_audio_packets(c);
+ return url_fseek(&s->pb, offset, SEEK_SET);
}
static int dv_read_close(AVFormatContext *s)
projects / ffmpeg / blobdiff