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Diffstat (limited to 'contrib/ffmpeg/libavformat/dv.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/dv.c | 451 |
1 files changed, 0 insertions, 451 deletions
diff --git a/contrib/ffmpeg/libavformat/dv.c b/contrib/ffmpeg/libavformat/dv.c deleted file mode 100644 index 10a306260..000000000 --- a/contrib/ffmpeg/libavformat/dv.c +++ /dev/null @@ -1,451 +0,0 @@ -/* - * 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_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) -{ - 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); - - 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; -} - -#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 |