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Diffstat (limited to 'contrib/ffmpeg/libavformat/dv.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/dv.c | 451 |
1 files changed, 451 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavformat/dv.c b/contrib/ffmpeg/libavformat/dv.c new file mode 100644 index 000000000..3ff8a3fe2 --- /dev/null +++ b/contrib/ffmpeg/libavformat/dv.c @@ -0,0 +1,451 @@ +/* + * 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 "avformat.h" +#include "dvdata.h" +#include "dv.h" + +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; +}; + +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* 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; + + 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 - 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; +} + +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 - 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; + } + 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->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; +} + +/* + * 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; + } + + 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_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_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. + ************************************************************/ + +typedef struct RawDVContext { + DVDemuxContext* dv_demux; + uint8_t buf[DV_MAX_FRAME_SIZE]; +} RawDVContext; + +static int dv_read_header(AVFormatContext *s, + AVFormatParameters *ap) +{ + 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; +} + + +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); + + c->frames= offset / c->sys->frame_size; + 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); + + dv_flush_audio_packets(c); + 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; +} + +#ifdef CONFIG_DV_DEMUXER +AVInputFormat dv_demuxer = { + "dv", + "DV video format", + sizeof(RawDVContext), + NULL, + dv_read_header, + dv_read_packet, + dv_read_close, + dv_read_seek, + .extensions = "dv,dif", +}; +#endif |