-/*
+/*
+ * General DV muxer/demuxer
+ * Copyright (c) 2003 Roman Shaposhnik
+ *
+ * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
+ * of DV technical info.
+ *
* Raw DV format
* Copyright (c) 2002 Fabrice Bellard.
*
- * This library is free software; you can redistribute it and/or
+ * 50 Mbps (DVCPRO50) support
+ * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include <time.h>
#include "avformat.h"
+#include "dvdata.h"
+#include "dv.h"
-#define NTSC_FRAME_SIZE 120000
-#define PAL_FRAME_SIZE 144000
+struct DVDemuxContext {
+ const DVprofile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
+ AVFormatContext* fctx;
+ AVStream* vst;
+ AVStream* ast[2];
+ AVPacket audio_pkt[2];
+ uint8_t audio_buf[2][8192];
+ int ach;
+ int frames;
+ uint64_t abytes;
+};
-typedef struct DVDemuxContext {
- int is_audio;
- uint8_t buf[PAL_FRAME_SIZE];
- int size;
-} DVDemuxContext;
+static inline uint16_t dv_audio_12to16(uint16_t sample)
+{
+ uint16_t shift, result;
-/* raw input */
-static int dv_read_header(AVFormatContext *s,
- AVFormatParameters *ap)
+ sample = (sample < 0x800) ? sample : sample | 0xf000;
+ shift = (sample & 0xf00) >> 8;
+
+ if (shift < 0x2 || shift > 0xd) {
+ result = sample;
+ } else if (shift < 0x8) {
+ shift--;
+ result = (sample - (256 * shift)) << shift;
+ } else {
+ shift = 0xe - shift;
+ result = ((sample + ((256 * shift) + 1)) << shift) - 1;
+ }
+
+ return result;
+}
+
+/*
+ * This is the dumbest implementation of all -- it simply looks at
+ * a fixed offset and if pack isn't there -- fails. We might want
+ * to have a fallback mechanism for complete search of missing packs.
+ */
+static const uint8_t* dv_extract_pack(uint8_t* frame, enum dv_pack_type t)
{
- AVStream *vst, *ast;
- DVDemuxContext *c = s->priv_data;
+ int offs;
- vst = av_new_stream(s, 0);
- if (!vst)
- return AVERROR_NOMEM;
- vst->codec.codec_type = CODEC_TYPE_VIDEO;
- vst->codec.codec_id = CODEC_ID_DVVIDEO;
+ switch (t) {
+ case dv_audio_source:
+ offs = (80*6 + 80*16*3 + 3);
+ break;
+ case dv_audio_control:
+ offs = (80*6 + 80*16*4 + 3);
+ break;
+ case dv_video_control:
+ offs = (80*5 + 48 + 5);
+ break;
+ default:
+ return NULL;
+ }
+ return (frame[offs] == t ? &frame[offs] : NULL);
+}
- ast = av_new_stream(s, 1);
- if (!ast)
- return AVERROR_NOMEM;
+/*
+ * There's a couple of assumptions being made here:
+ * 1. By default we silence erroneous (0x8000/16bit 0x800/12bit) audio samples.
+ * We can pass them upwards when ffmpeg will be ready to deal with them.
+ * 2. We don't do software emphasis.
+ * 3. Audio is always returned as 16bit linear samples: 12bit nonlinear samples
+ * are converted into 16bit linear ones.
+ */
+static int dv_extract_audio(uint8_t* frame, uint8_t* pcm, uint8_t* pcm2,
+ const DVprofile *sys)
+{
+ int size, chan, i, j, d, of, smpls, freq, quant, half_ch;
+ uint16_t lc, rc;
+ const uint8_t* as_pack;
- ast->codec.codec_type = CODEC_TYPE_AUDIO;
- ast->codec.codec_id = CODEC_ID_DVAUDIO;
- ast->codec.channels = 2;
- c->is_audio = 0;
+ as_pack = dv_extract_pack(frame, dv_audio_source);
+ if (!as_pack) /* No audio ? */
+ return 0;
- 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 */
+
+ if (quant > 1)
+ return -1; /* Unsupported quantization */
+
+ size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
+ half_ch = sys->difseg_size/2;
+
+ /* for each DIF channel */
+ for (chan = 0; chan < sys->n_difchan; chan++) {
+ /* for each DIF segment */
+ for (i = 0; i < sys->difseg_size; i++) {
+ frame += 6 * 80; /* skip DIF segment header */
+ if (quant == 1 && i == half_ch) {
+ /* next stereo channel (12bit mode only) */
+ if (!pcm2)
+ break;
+ else
+ pcm = pcm2;
+ }
+
+ /* for each AV sequence */
+ for (j = 0; j < 9; j++) {
+ for (d = 8; d < 80; d += 2) {
+ if (quant == 0) { /* 16bit quantization */
+ of = sys->audio_shuffle[i][j] + (d - 8)/2 * sys->audio_stride;
+ if (of*2 >= size)
+ continue;
+
+ pcm[of*2] = frame[d+1]; // FIXME: may be we have to admit
+ pcm[of*2+1] = frame[d]; // that DV is a big endian PCM
+ if (pcm[of*2+1] == 0x80 && pcm[of*2] == 0x00)
+ pcm[of*2+1] = 0;
+ } else { /* 12bit quantization */
+ lc = ((uint16_t)frame[d] << 4) |
+ ((uint16_t)frame[d+2] >> 4);
+ rc = ((uint16_t)frame[d+1] << 4) |
+ ((uint16_t)frame[d+2] & 0x0f);
+ lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
+ rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
+
+ of = sys->audio_shuffle[i%half_ch][j] + (d - 8)/3 * sys->audio_stride;
+ if (of*2 >= size)
+ continue;
+
+ pcm[of*2] = lc & 0xff; // FIXME: may be we have to admit
+ pcm[of*2+1] = lc >> 8; // that DV is a big endian PCM
+ of = sys->audio_shuffle[i%half_ch+half_ch][j] +
+ (d - 8)/3 * sys->audio_stride;
+ pcm[of*2] = rc & 0xff; // FIXME: may be we have to admit
+ pcm[of*2+1] = rc >> 8; // that DV is a big endian PCM
+ ++d;
+ }
+ }
+
+ frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
+ }
+ }
+
+ /* next stereo channel (50Mbps only) */
+ if(!pcm2)
+ break;
+ pcm = pcm2;
+ }
+
+ return size;
}
-/* XXX: build fake audio stream when DV audio decoder will be finished */
-static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
+static int dv_extract_audio_info(DVDemuxContext* c, uint8_t* frame)
{
- int ret, dsf;
- DVDemuxContext *c = s->priv_data;
-
- if (!c->is_audio) {
- ret = get_buffer(&s->pb, c->buf, 4);
- if (ret <= 0)
- return -EIO;
- dsf = c->buf[3] & 0x80;
- if (!dsf)
- c->size = NTSC_FRAME_SIZE;
- else
- c->size = PAL_FRAME_SIZE;
-
- ret = get_buffer(&s->pb, c->buf + 4, c->size - 4);
- if (ret <= 0)
- return -EIO;
+ const uint8_t* as_pack;
+ int freq, stype, smpls, quant, i, ach;
+
+ as_pack = dv_extract_pack(frame, dv_audio_source);
+ if (!as_pack || !c->sys) { /* No audio ? */
+ c->ach = 0;
+ 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 */
+ stype = (as_pack[3] & 0x1f); /* 0 - 2CH, 2 - 4CH */
+ quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
+
+ /* note: ach counts PAIRS of channels (i.e. stereo channels) */
+ ach = (stype == 2 || (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;
}
-
- if (av_new_packet(pkt, c->size) < 0)
- return -EIO;
-
- pkt->stream_index = c->is_audio;
- c->is_audio = !c->is_audio;
- memcpy(pkt->data, c->buf, c->size);
- return ret;
+ c->ach = i;
+
+ return (c->sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */;
}
-static int dv_read_close(AVFormatContext *s)
+static int dv_extract_video_info(DVDemuxContext *c, uint8_t* frame)
{
- return 0;
+ const uint8_t* vsc_pack;
+ AVCodecContext* avctx;
+ int apt, is16_9;
+ int size = 0;
+
+ if (c->sys) {
+ avctx = c->vst->codec;
+
+ av_set_pts_info(c->vst, 64, c->sys->frame_rate_base, c->sys->frame_rate);
+ avctx->time_base= (AVRational){c->sys->frame_rate_base, c->sys->frame_rate};
+ if(!avctx->width){
+ avctx->width = c->sys->width;
+ avctx->height = c->sys->height;
+ }
+ avctx->pix_fmt = c->sys->pix_fmt;
+
+ /* finding out SAR is a little bit messy */
+ vsc_pack = dv_extract_pack(frame, dv_video_control);
+ apt = frame[4] & 0x07;
+ is16_9 = (vsc_pack && ((vsc_pack[2] & 0x07) == 0x02 ||
+ (!apt && (vsc_pack[2] & 0x07) == 0x07)));
+ avctx->sample_aspect_ratio = c->sys->sar[is16_9];
+ avctx->bit_rate = av_rescale(c->sys->frame_size * 8,
+ c->sys->frame_rate,
+ c->sys->frame_rate_base);
+ size = c->sys->frame_size;
+ }
+ return size;
}
-static AVInputFormat dv_iformat = {
- "dv",
- "DV video format",
- sizeof(DVDemuxContext),
- NULL,
- dv_read_header,
- dv_read_packet,
- dv_read_close,
- .extensions = "dv",
-};
+/*
+ * The following 3 functions constitute our interface to the world
+ */
-#if 0
-int dv_write_header(struct AVFormatContext *s)
+DVDemuxContext* dv_init_demux(AVFormatContext *s)
{
- return 0;
+ DVDemuxContext *c;
+
+ c = av_mallocz(sizeof(DVDemuxContext));
+ if (!c)
+ return NULL;
+
+ c->vst = av_new_stream(s, 0);
+ if (!c->vst) {
+ av_free(c);
+ return NULL;
+ }
+
+ c->sys = NULL;
+ c->fctx = s;
+ c->ast[0] = c->ast[1] = NULL;
+ c->ach = 0;
+ c->frames = 0;
+ c->abytes = 0;
+
+ c->vst->codec->codec_type = CODEC_TYPE_VIDEO;
+ c->vst->codec->codec_id = CODEC_ID_DVVIDEO;
+ c->vst->codec->bit_rate = 25000000;
+ c->vst->start_time = 0;
+
+ return c;
+}
+
+int dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
+{
+ int size = -1;
+ int i;
+
+ for (i=0; i<c->ach; i++) {
+ if (c->ast[i] && c->audio_pkt[i].size) {
+ *pkt = c->audio_pkt[i];
+ c->audio_pkt[i].size = 0;
+ size = pkt->size;
+ break;
+ }
+ }
+
+ return size;
}
-int dv_write_packet(struct AVFormatContext *s,
- int stream_index,
- unsigned char *buf, int size, int force_pts)
+int dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
+ uint8_t* buf, int buf_size)
+{
+ int size, i;
+
+ if (buf_size < DV_PROFILE_BYTES ||
+ !(c->sys = dv_frame_profile(buf)) ||
+ buf_size < c->sys->frame_size) {
+ return -1; /* Broken frame, or not enough data */
+ }
+
+ /* Queueing audio packet */
+ /* FIXME: in case of no audio/bad audio we have to do something */
+ size = dv_extract_audio_info(c, buf);
+ for (i=0; i<c->ach; i++) {
+ 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_buf[0], c->audio_buf[1], c->sys);
+ c->abytes += size;
+
+ /* Now it's time to return video packet */
+ size = dv_extract_video_info(c, buf);
+ av_init_packet(pkt);
+ pkt->data = buf;
+ pkt->size = size;
+ pkt->flags |= PKT_FLAG_KEY;
+ pkt->stream_index = c->vst->id;
+ pkt->pts = c->frames;
+
+ c->frames++;
+
+ return size;
+}
+
+static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c,
+ int64_t timestamp, int flags)
+{
+ // FIXME: sys may be wrong if last dv_read_packet() failed (buffer is junk)
+ const DVprofile* sys = dv_codec_profile(c->vst->codec);
+ int64_t offset;
+ int64_t size = url_fsize(&s->pb);
+ int64_t max_offset = ((size-1) / sys->frame_size) * sys->frame_size;
+
+ offset = sys->frame_size * timestamp;
+
+ if (offset > max_offset) offset = max_offset;
+ else if (offset < 0) offset = 0;
+
+ return offset;
+}
+
+void dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
+{
+ c->frames= frame_offset;
+ if (c->ach)
+ c->abytes= av_rescale(c->frames,
+ c->ast[0]->codec->bit_rate * (int64_t)c->sys->frame_rate_base,
+ 8*c->sys->frame_rate);
+ c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
+}
+
+/************************************************************
+ * Implementation of the easiest DV storage of all -- raw DV.
+ ************************************************************/
+
+typedef struct RawDVContext {
+ DVDemuxContext* dv_demux;
+ uint8_t buf[DV_MAX_FRAME_SIZE];
+} RawDVContext;
+
+static int dv_read_header(AVFormatContext *s,
+ AVFormatParameters *ap)
{
- put_buffer(&s->pb, buf, size);
- put_flush_packet(&s->pb);
+ RawDVContext *c = s->priv_data;
+
+ c->dv_demux = dv_init_demux(s);
+ if (!c->dv_demux)
+ return -1;
+
+ if (get_buffer(&s->pb, c->buf, DV_PROFILE_BYTES) <= 0 ||
+ url_fseek(&s->pb, -DV_PROFILE_BYTES, SEEK_CUR) < 0)
+ return AVERROR_IO;
+
+ c->dv_demux->sys = dv_frame_profile(c->buf);
+ s->bit_rate = av_rescale(c->dv_demux->sys->frame_size * 8,
+ c->dv_demux->sys->frame_rate,
+ c->dv_demux->sys->frame_rate_base);
+
return 0;
}
-int dv_write_trailer(struct AVFormatContext *s)
+
+static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ int size;
+ RawDVContext *c = s->priv_data;
+
+ size = dv_get_packet(c->dv_demux, pkt);
+
+ if (size < 0) {
+ size = c->dv_demux->sys->frame_size;
+ if (get_buffer(&s->pb, c->buf, size) <= 0)
+ return AVERROR_IO;
+
+ size = dv_produce_packet(c->dv_demux, pkt, c->buf, size);
+ }
+
+ return size;
+}
+
+static int dv_read_seek(AVFormatContext *s, int stream_index,
+ int64_t timestamp, int flags)
{
+ RawDVContext *r = s->priv_data;
+ DVDemuxContext *c = r->dv_demux;
+ int64_t offset= dv_frame_offset(s, c, timestamp, flags);
+
+ dv_offset_reset(c, offset / c->sys->frame_size);
+
+ return url_fseek(&s->pb, offset, SEEK_SET);
+}
+
+static int dv_read_close(AVFormatContext *s)
+{
+ RawDVContext *c = s->priv_data;
+ av_free(c->dv_demux);
return 0;
}
-AVOutputFormat dv_oformat = {
+#ifdef CONFIG_DV_DEMUXER
+AVInputFormat dv_demuxer = {
"dv",
"DV video format",
+ sizeof(RawDVContext),
NULL,
- "dv",
- 0,
- CODEC_ID_DVVIDEO,
- CODEC_ID_DVAUDIO,
- dv_write_header,
- dv_write_packet,
- dv_write_trailer,
+ dv_read_header,
+ dv_read_packet,
+ dv_read_close,
+ dv_read_seek,
+ .extensions = "dv,dif",
};
#endif
-
-int dv_init(void)
-{
- av_register_input_format(&dv_iformat);
- // av_register_output_format(&dv_oformat);
- return 0;
-}
projects / ffmpeg / blobdiff