X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Fdv.c;h=a75b4a6b0ddcc664ccfb2df5775948da91f05cb8;hb=da4c2dab17af7f7b09ed18d74ec984d214451a51;hp=64cc0bef1b4604fe915fa9b43dc9d1929f759907;hpb=425ed6e223b8dd190e9fbeb4a41c6479f3fc8df0;p=ffmpeg diff --git a/libavformat/dv.c b/libavformat/dv.c index 64cc0bef1b4..a75b4a6b0dd 100644 --- a/libavformat/dv.c +++ b/libavformat/dv.c @@ -1,141 +1,521 @@ -/* +/* + * General DV muxer/demuxer + * Copyright (c) 2003 Roman Shaposhnik + * + * Many thanks to Dan Dennedy for providing wealth + * of DV technical info. + * * Raw DV format - * Copyright (c) 2002 Fabrice Bellard. + * Copyright (c) 2002 Fabrice Bellard + * + * 50 Mbps (DVCPRO50) and 100 Mbps (DVCPRO HD) support + * Copyright (c) 2006 Daniel Maas + * Funded by BBC Research & Development + * + * This file is part of FFmpeg. * - * This library is free software; you can redistribute it and/or + * 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 #include "avformat.h" +#include "libavcodec/dvdata.h" +#include "libavutil/intreadwrite.h" +#include "dv.h" + +struct DVDemuxContext { + const DVprofile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */ + AVFormatContext* fctx; + AVStream* vst; + AVStream* ast[4]; + AVPacket audio_pkt[4]; + uint8_t audio_buf[4][8192]; + int ach; + int frames; + uint64_t abytes; +}; + +static inline uint16_t dv_audio_12to16(uint16_t sample) +{ + uint16_t shift, result; + + 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) +{ + int offs; + + 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; +} + +/* + * 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* ppcm[4], + const DVprofile *sys) +{ + int size, chan, i, j, d, of, smpls, freq, quant, half_ch; + uint16_t lc, rc; + const uint8_t* as_pack; + uint8_t *pcm, ipcm; + + as_pack = dv_extract_pack(frame, dv_audio_source); + if (!as_pack) /* No audio ? */ + 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 - 32kHz */ + 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; + + /* We work with 720p frames split in half, thus even frames have + * channels 0,1 and odd 2,3. */ + ipcm = (sys->height == 720 && !(frame[1] & 0x0C)) ? 2 : 0; + pcm = ppcm[ipcm++]; + + /* 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) */ + pcm = ppcm[ipcm++]; + if (!pcm) + break; + } + + /* 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: maybe 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: maybe 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: maybe 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 and 100Mbps only) */ + pcm = ppcm[ipcm++]; + if (!pcm) + break; + } + + return size; +} + +static int dv_extract_audio_info(DVDemuxContext* c, uint8_t* frame) +{ + 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 - 32kHz */ + stype = (as_pack[3] & 0x1f); /* 0 - 2CH, 2 - 4CH, 3 - 8CH */ + quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */ + + /* note: ach counts PAIRS of channels (i.e. stereo channels) */ + ach = ((int[4]){ 1, 0, 2, 4})[stype]; + if (ach == 1 && quant && freq == 2) + ach = 2; + + /* 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 (c->sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */; +} + +static int dv_extract_video_info(DVDemuxContext *c, uint8_t* frame) +{ + 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->time_base.num, + c->sys->time_base.den); + avctx->time_base= c->sys->time_base; + 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))); + c->vst->sample_aspect_ratio = c->sys->sar[is16_9]; + avctx->bit_rate = av_rescale_q(c->sys->frame_size, (AVRational){8,1}, + c->sys->time_base); + size = c->sys->frame_size; + } + return size; +} + +/* + * The following 3 functions constitute our interface to the world + */ + +DVDemuxContext* dv_init_demux(AVFormatContext *s) +{ + 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; + } -#define NTSC_FRAME_SIZE 120000 -#define PAL_FRAME_SIZE 144000 + c->sys = NULL; + c->fctx = s; + memset(c->ast, 0, sizeof(c->ast)); + c->ach = 0; + c->frames = 0; + c->abytes = 0; -typedef struct DVDemuxContext { - int is_audio; - uint8_t buf[PAL_FRAME_SIZE]; - int size; -} DVDemuxContext; + 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_produce_packet(DVDemuxContext *c, AVPacket *pkt, + uint8_t* buf, int buf_size) +{ + int size, i; + uint8_t *ppcm[4] = {0}; + + if (buf_size < DV_PROFILE_BYTES || + !(c->sys = dv_frame_profile(c->sys, buf, buf_size)) || + 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; + ppcm[i] = c->audio_buf[i]; + } + dv_extract_audio(buf, ppcm, c->sys); + + /* We work with 720p frames split in half, thus even frames have + * channels 0,1 and odd 2,3. */ + if (c->sys->height == 720) { + if (buf[1] & 0x0C) { + c->audio_pkt[2].size = c->audio_pkt[3].size = 0; + } else { + c->audio_pkt[0].size = c->audio_pkt[1].size = 0; + c->abytes += size; + } + } else { + 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_q(c->frames, c->sys->time_base, + (AVRational){8, c->ast[0]->codec->bit_rate}); + c->audio_pkt[0].size = c->audio_pkt[1].size = 0; + c->audio_pkt[2].size = c->audio_pkt[3].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; -/* raw input */ static int dv_read_header(AVFormatContext *s, AVFormatParameters *ap) { - AVStream *vst, *ast; - DVDemuxContext *c = s->priv_data; + unsigned state, marker_pos = 0; + RawDVContext *c = s->priv_data; - 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; + c->dv_demux = dv_init_demux(s); + if (!c->dv_demux) + return -1; + state = get_be32(s->pb); + while ((state & 0xffffff7f) != 0x1f07003f) { + if (url_feof(s->pb)) { + av_log(s, AV_LOG_ERROR, "Cannot find DV header.\n"); + return -1; + } + if (state == 0x003f0700 || state == 0xff3f0700) + marker_pos = url_ftell(s->pb); + if (state == 0xff3f0701 && url_ftell(s->pb) - marker_pos == 80) { + url_fseek(s->pb, -163, SEEK_CUR); + state = get_be32(s->pb); + break; + } + state = (state << 8) | get_byte(s->pb); + } + AV_WB32(c->buf, state); + + if (get_buffer(s->pb, c->buf + 4, DV_PROFILE_BYTES - 4) <= 0 || + url_fseek(s->pb, -DV_PROFILE_BYTES, SEEK_CUR) < 0) + return AVERROR(EIO); - ast = av_new_stream(s, 1); - if (!ast) - return AVERROR_NOMEM; + c->dv_demux->sys = dv_frame_profile(c->dv_demux->sys, c->buf, DV_PROFILE_BYTES); + if (!c->dv_demux->sys) { + av_log(s, AV_LOG_ERROR, "Can't determine profile of DV input stream.\n"); + return -1; + } - ast->codec.codec_type = CODEC_TYPE_AUDIO; - ast->codec.codec_id = CODEC_ID_DVAUDIO; - ast->codec.channels = 2; - c->is_audio = 0; + s->bit_rate = av_rescale_q(c->dv_demux->sys->frame_size, (AVRational){8,1}, + c->dv_demux->sys->time_base); return 0; } -/* XXX: build fake audio stream when DV audio decoder will be finished */ + static int dv_read_packet(AVFormatContext *s, AVPacket *pkt) { - 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; + int size; + RawDVContext *c = s->priv_data; + + size = dv_get_packet(c->dv_demux, pkt); + + if (size < 0) { + if (!c->dv_demux->sys) + return AVERROR(EIO); + size = c->dv_demux->sys->frame_size; + if (get_buffer(s->pb, c->buf, size) <= 0) + return AVERROR(EIO); + + size = dv_produce_packet(c->dv_demux, pkt, c->buf, size); } - - 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; + + return size; } -static int dv_read_close(AVFormatContext *s) +static int dv_read_seek(AVFormatContext *s, int stream_index, + int64_t timestamp, int flags) { - return 0; -} + RawDVContext *r = s->priv_data; + DVDemuxContext *c = r->dv_demux; + int64_t offset = dv_frame_offset(s, c, timestamp, flags); -static AVInputFormat dv_iformat = { - "dv", - "DV video format", - sizeof(DVDemuxContext), - NULL, - dv_read_header, - dv_read_packet, - dv_read_close, - .extensions = "dv", -}; + dv_offset_reset(c, offset / c->sys->frame_size); -#if 0 -int dv_write_header(struct AVFormatContext *s) -{ - return 0; + offset = url_fseek(s->pb, offset, SEEK_SET); + return (offset < 0) ? offset : 0; } -int dv_write_packet(struct AVFormatContext *s, - int stream_index, - unsigned char *buf, int size, int force_pts) +static int dv_read_close(AVFormatContext *s) { - put_buffer(&s->pb, buf, size); - put_flush_packet(&s->pb); + RawDVContext *c = s->priv_data; + av_free(c->dv_demux); return 0; } -int dv_write_trailer(struct AVFormatContext *s) +static int dv_probe(AVProbeData *p) { + unsigned state, marker_pos = 0; + int i; + + if (p->buf_size < 5) + return 0; + + state = AV_RB32(p->buf); + for (i = 4; i < p->buf_size; i++) { + if ((state & 0xffffff7f) == 0x1f07003f) + return AVPROBE_SCORE_MAX*3/4; // not max to avoid dv in mov to match + if (state == 0x003f0700 || state == 0xff3f0700) + marker_pos = i; + if (state == 0xff3f0701 && i - marker_pos == 80) + return AVPROBE_SCORE_MAX/4; + state = (state << 8) | p->buf[i]; + } + return 0; } -AVOutputFormat dv_oformat = { - "dv", - "DV video format", - NULL, +#if CONFIG_DV_DEMUXER +AVInputFormat dv_demuxer = { "dv", - 0, - CODEC_ID_DVVIDEO, - CODEC_ID_DVAUDIO, - dv_write_header, - dv_write_packet, - dv_write_trailer, + NULL_IF_CONFIG_SMALL("DV video format"), + sizeof(RawDVContext), + dv_probe, + 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; -}