diff options
Diffstat (limited to 'ffmpeg/libavformat/dvenc.c')
| -rw-r--r-- | ffmpeg/libavformat/dvenc.c | 420 |
1 files changed, 420 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/dvenc.c b/ffmpeg/libavformat/dvenc.c new file mode 100644 index 0000000..0b3811e --- /dev/null +++ b/ffmpeg/libavformat/dvenc.c @@ -0,0 +1,420 @@ +/* + * 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 + * + * 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 2.1 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 + */ +#include <time.h> +#include <stdarg.h> + +#include "avformat.h" +#include "internal.h" +#include "libavcodec/dv_profile.h" +#include "libavcodec/dvdata.h" +#include "dv.h" +#include "libavutil/fifo.h" +#include "libavutil/mathematics.h" +#include "libavutil/intreadwrite.h" +#include "libavutil/opt.h" +#include "libavutil/timecode.h" + +#define MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio + +struct DVMuxContext { + AVClass *av_class; + const DVprofile* sys; /* current DV profile, e.g.: 525/60, 625/50 */ + int n_ast; /* number of stereo audio streams (up to 2) */ + AVStream *ast[2]; /* stereo audio streams */ + AVFifoBuffer *audio_data[2]; /* FIFO for storing excessive amounts of PCM */ + int frames; /* current frame number */ + int64_t start_time; /* recording start time */ + int has_audio; /* frame under construction has audio */ + int has_video; /* frame under construction has video */ + uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under construction */ + AVTimecode tc; /* timecode context */ +}; + +static const int dv_aaux_packs_dist[12][9] = { + { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, + { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, + { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, + { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, + { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, + { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, + { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, + { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, + { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, + { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, + { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, + { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, +}; + +static int dv_audio_frame_size(const DVprofile* sys, int frame) +{ + return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) / + sizeof(sys->audio_samples_dist[0]))]; +} + +static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, ...) +{ + struct tm tc; + time_t ct; + uint32_t timecode; + va_list ap; + + buf[0] = (uint8_t)pack_id; + switch (pack_id) { + case dv_timecode: + timecode = av_timecode_get_smpte_from_framenum(&c->tc, c->frames); + timecode |= 1<<23 | 1<<15 | 1<<7 | 1<<6; // biphase and binary group flags + AV_WB32(buf + 1, timecode); + break; + case dv_audio_source: /* AAUX source pack */ + va_start(ap, buf); + buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */ + (1 << 6) | /* reserved -- always 1 */ + (dv_audio_frame_size(c->sys, c->frames) - + c->sys->audio_min_samples[0]); + /* # of samples */ + buf[2] = (0 << 7) | /* multi-stereo */ + (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */ + (0 << 4) | /* pair bit: 0 -- one pair of channels */ + !!va_arg(ap, int); /* audio mode */ + buf[3] = (1 << 7) | /* res */ + (1 << 6) | /* multi-language flag */ + (c->sys->dsf << 5) | /* system: 60fields/50fields */ + (c->sys->n_difchan & 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */ + buf[4] = (1 << 7) | /* emphasis: 1 -- off */ + (0 << 6) | /* emphasis time constant: 0 -- reserved */ + (0 << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */ + 0; /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */ + va_end(ap); + break; + case dv_audio_control: + buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */ + (1 << 4) | /* input source: 1 -- digital input */ + (3 << 2) | /* compression: 3 -- no information */ + 0; /* misc. info/SMPTE emphasis off */ + buf[2] = (1 << 7) | /* recording start point: 1 -- no */ + (1 << 6) | /* recording end point: 1 -- no */ + (1 << 3) | /* recording mode: 1 -- original */ + 7; + buf[3] = (1 << 7) | /* direction: 1 -- forward */ + (c->sys->pix_fmt == AV_PIX_FMT_YUV420P ? 0x20 : /* speed */ + c->sys->ltc_divisor * 4); + buf[4] = (1 << 7) | /* reserved -- always 1 */ + 0x7f; /* genre category */ + break; + case dv_audio_recdate: + case dv_video_recdate: /* VAUX recording date */ + ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num, + c->sys->time_base.den, AV_ROUND_DOWN); + ff_brktimegm(ct, &tc); + buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */ + /* 0xff is very likely to be "unknown" */ + buf[2] = (3 << 6) | /* reserved -- always 1 */ + ((tc.tm_mday / 10) << 4) | /* Tens of day */ + (tc.tm_mday % 10); /* Units of day */ + buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */ + ((tc.tm_mon / 10) << 4) | /* Tens of month */ + (tc.tm_mon % 10); /* Units of month */ + buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */ + (tc.tm_year % 10); /* Units of year */ + break; + case dv_audio_rectime: /* AAUX recording time */ + case dv_video_rectime: /* VAUX recording time */ + ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num, + c->sys->time_base.den, AV_ROUND_DOWN); + ff_brktimegm(ct, &tc); + buf[1] = (3 << 6) | /* reserved -- always 1 */ + 0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */ + buf[2] = (1 << 7) | /* reserved -- always 1 */ + ((tc.tm_sec / 10) << 4) | /* Tens of seconds */ + (tc.tm_sec % 10); /* Units of seconds */ + buf[3] = (1 << 7) | /* reserved -- always 1 */ + ((tc.tm_min / 10) << 4) | /* Tens of minutes */ + (tc.tm_min % 10); /* Units of minutes */ + buf[4] = (3 << 6) | /* reserved -- always 1 */ + ((tc.tm_hour / 10) << 4) | /* Tens of hours */ + (tc.tm_hour % 10); /* Units of hours */ + break; + default: + buf[1] = buf[2] = buf[3] = buf[4] = 0xff; + } + return 5; +} + +static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr) +{ + int i, j, d, of, size; + size = 4 * dv_audio_frame_size(c->sys, c->frames); + frame_ptr += channel * c->sys->difseg_size * 150 * 80; + 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], i >= c->sys->difseg_size/2); + 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) + continue; + + frame_ptr[d] = *av_fifo_peek2(c->audio_data[channel], of*2+1); // FIXME: maybe we have to admit + frame_ptr[d+1] = *av_fifo_peek2(c->audio_data[channel], of*2); // that DV is a big-endian PCM + } + frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */ + } + } +} + +static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame) +{ + int j, k; + uint8_t* buf; + + for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80) { + /* DV subcode: 2nd and 3d DIFs */ + for (j = 80; j < 80 * 3; j += 80) { + for (k = 6; k < 6 * 8; k += 8) + dv_write_pack(dv_timecode, c, &buf[j+k]); + + if (((long)(buf-frame)/(c->sys->frame_size/(c->sys->difseg_size*c->sys->n_difchan))%c->sys->difseg_size) > 5) { /* FIXME: is this really needed ? */ + dv_write_pack(dv_video_recdate, c, &buf[j+14]); + dv_write_pack(dv_video_rectime, c, &buf[j+22]); + dv_write_pack(dv_video_recdate, c, &buf[j+38]); + dv_write_pack(dv_video_rectime, c, &buf[j+46]); + } + } + + /* DV VAUX: 4th, 5th and 6th 3DIFs */ + for (j = 80*3 + 3; j < 80*6; j += 80) { + dv_write_pack(dv_video_recdate, c, &buf[j+5*2]); + dv_write_pack(dv_video_rectime, c, &buf[j+5*3]); + dv_write_pack(dv_video_recdate, c, &buf[j+5*11]); + dv_write_pack(dv_video_rectime, c, &buf[j+5*12]); + } + } +} + +/* + * The following 3 functions constitute our interface to the world + */ + +static int dv_assemble_frame(DVMuxContext *c, AVStream* st, + uint8_t* data, int data_size, uint8_t** frame) +{ + int i, reqasize; + + *frame = &c->frame_buf[0]; + reqasize = 4 * dv_audio_frame_size(c->sys, c->frames); + + switch (st->codec->codec_type) { + case AVMEDIA_TYPE_VIDEO: + /* FIXME: we have to have more sensible approach than this one */ + if (c->has_video) + av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames); + + memcpy(*frame, data, c->sys->frame_size); + c->has_video = 1; + break; + case AVMEDIA_TYPE_AUDIO: + for (i = 0; i < c->n_ast && st != c->ast[i]; i++); + + /* FIXME: we have to have more sensible approach than this one */ + if (av_fifo_size(c->audio_data[i]) + data_size >= 100*MAX_AUDIO_FRAME_SIZE) + av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames); + av_fifo_generic_write(c->audio_data[i], data, data_size, NULL); + + /* Let us see if we've got enough audio for one DV frame. */ + c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i); + + break; + default: + break; + } + + /* Let us see if we have enough data to construct one DV frame. */ + if (c->has_video == 1 && c->has_audio + 1 == 1 << c->n_ast) { + dv_inject_metadata(c, *frame); + c->has_audio = 0; + for (i=0; i < c->n_ast; i++) { + dv_inject_audio(c, i, *frame); + av_fifo_drain(c->audio_data[i], reqasize); + c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i); + } + + c->has_video = 0; + + c->frames++; + + return c->sys->frame_size; + } + + return 0; +} + +static DVMuxContext* dv_init_mux(AVFormatContext* s) +{ + DVMuxContext *c = s->priv_data; + AVStream *vst = NULL; + AVDictionaryEntry *t; + int i; + + /* we support at most 1 video and 2 audio streams */ + if (s->nb_streams > 3) + return NULL; + + c->n_ast = 0; + c->ast[0] = c->ast[1] = NULL; + + /* We have to sort out where audio and where video stream is */ + for (i=0; i<s->nb_streams; i++) { + switch (s->streams[i]->codec->codec_type) { + case AVMEDIA_TYPE_VIDEO: + if (vst) return NULL; + vst = s->streams[i]; + break; + case AVMEDIA_TYPE_AUDIO: + if (c->n_ast > 1) return NULL; + c->ast[c->n_ast++] = s->streams[i]; + break; + default: + goto bail_out; + } + } + + /* Some checks -- DV format is very picky about its incoming streams */ + if (!vst || vst->codec->codec_id != AV_CODEC_ID_DVVIDEO) + goto bail_out; + for (i=0; i<c->n_ast; i++) { + if (c->ast[i] && (c->ast[i]->codec->codec_id != AV_CODEC_ID_PCM_S16LE || + c->ast[i]->codec->sample_rate != 48000 || + c->ast[i]->codec->channels != 2)) + goto bail_out; + } + c->sys = avpriv_dv_codec_profile(vst->codec); + if (!c->sys) + goto bail_out; + + if ((c->n_ast > 1) && (c->sys->n_difchan < 2)) { + /* only 1 stereo pair is allowed in 25Mbps mode */ + goto bail_out; + } + + /* Ok, everything seems to be in working order */ + c->frames = 0; + c->has_audio = 0; + c->has_video = 0; + if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) + c->start_time = ff_iso8601_to_unix_time(t->value); + + for (i=0; i < c->n_ast; i++) { + if (c->ast[i] && !(c->audio_data[i]=av_fifo_alloc(100*MAX_AUDIO_FRAME_SIZE))) { + while (i > 0) { + i--; + av_fifo_free(c->audio_data[i]); + } + goto bail_out; + } + } + + return c; + +bail_out: + return NULL; +} + +static void dv_delete_mux(DVMuxContext *c) +{ + int i; + for (i=0; i < c->n_ast; i++) + av_fifo_free(c->audio_data[i]); +} + +static int dv_write_header(AVFormatContext *s) +{ + AVRational rate; + DVMuxContext *dvc = s->priv_data; + AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0); + + if (!dv_init_mux(s)) { + av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n" + "Make sure that you supply exactly two streams:\n" + " video: 25fps or 29.97fps, audio: 2ch/48kHz/PCM\n" + " (50Mbps allows an optional second audio stream)\n"); + return -1; + } + rate.num = dvc->sys->ltc_divisor; + rate.den = 1; + if (!tcr) { // no global timecode, look into the streams + int i; + for (i = 0; i < s->nb_streams; i++) { + tcr = av_dict_get(s->streams[i]->metadata, "timecode", NULL, 0); + if (tcr) + break; + } + } + if (tcr && av_timecode_init_from_string(&dvc->tc, rate, tcr->value, s) >= 0) + return 0; + return av_timecode_init(&dvc->tc, rate, 0, 0, s); +} + +static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt) +{ + uint8_t* frame; + int fsize; + + fsize = dv_assemble_frame(s->priv_data, s->streams[pkt->stream_index], + pkt->data, pkt->size, &frame); + if (fsize > 0) { + avio_write(s->pb, frame, fsize); + avio_flush(s->pb); + } + return 0; +} + +/* + * We might end up with some extra A/V data without matching counterpart. + * E.g. video data without enough audio to write the complete frame. + * Currently we simply drop the last frame. I don't know whether this + * is the best strategy of all + */ +static int dv_write_trailer(struct AVFormatContext *s) +{ + dv_delete_mux(s->priv_data); + return 0; +} + +AVOutputFormat ff_dv_muxer = { + .name = "dv", + .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"), + .extensions = "dv", + .priv_data_size = sizeof(DVMuxContext), + .audio_codec = AV_CODEC_ID_PCM_S16LE, + .video_codec = AV_CODEC_ID_DVVIDEO, + .write_header = dv_write_header, + .write_packet = dv_write_packet, + .write_trailer = dv_write_trailer, +}; |