X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Fdv.c;h=1ba8698d201399b86d2c2507293e635150a99640;hb=9b56d5c11488656254e9aed8d964ef2b7c2ff5e6;hp=cdc5f7692303f4dd672d8d2b62ba74b6db3e6e8e;hpb=6b4aa5dac8f41aa452d0ce9a1bede9e59a303060;p=ffmpeg diff --git a/libavformat/dv.c b/libavformat/dv.c index cdc5f769230..1ba8698d201 100644 --- a/libavformat/dv.c +++ b/libavformat/dv.c @@ -1,5 +1,5 @@ /* - * General DV muxer/demuxer + * General DV demuxer * Copyright (c) 2003 Roman Shaposhnik * * Many thanks to Dan Dennedy for providing wealth @@ -12,30 +12,34 @@ * Copyright (c) 2006 Daniel Maas * Funded by BBC Research & Development * - * This file is part of FFmpeg. + * This file is part of Libav. * - * FFmpeg is free software; you can redistribute it and/or + * Libav 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, + * Libav 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 + * License along with Libav; 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 "internal.h" +#include "libavcodec/dv_profile.h" +#include "libavcodec/dv.h" +#include "libavutil/channel_layout.h" #include "libavutil/intreadwrite.h" +#include "libavutil/mathematics.h" #include "dv.h" struct DVDemuxContext { - const DVprofile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */ + const AVDVProfile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */ AVFormatContext* fctx; AVStream* vst; AVStream* ast[4]; @@ -59,7 +63,7 @@ static inline uint16_t dv_audio_12to16(uint16_t sample) shift--; result = (sample - (256 * shift)) << shift; } else { - shift = 0xe - shift; + shift = 0xe - shift; result = ((sample + ((256 * shift) + 1)) << shift) - 1; } @@ -71,19 +75,19 @@ static inline uint16_t dv_audio_12to16(uint16_t sample) * 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) +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); + offs = (80 * 6 + 80 * 16 * 3 + 3); break; case dv_audio_control: - offs = (80*6 + 80*16*4 + 3); + offs = (80 * 6 + 80 * 16 * 4 + 3); break; case dv_video_control: - offs = (80*5 + 48 + 5); + offs = (80 * 5 + 48 + 5); break; default: return NULL; @@ -92,43 +96,54 @@ static const uint8_t* dv_extract_pack(uint8_t* frame, enum dv_pack_type t) return frame[offs] == t ? &frame[offs] : NULL; } +static const int dv_audio_frequency[3] = { + 48000, 44100, 32000, +}; + /* * 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. + * We can pass them upwards when libavcodec 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) +static int dv_extract_audio(uint8_t *frame, uint8_t **ppcm, + const AVDVProfile *sys) { int size, chan, i, j, d, of, smpls, freq, quant, half_ch; uint16_t lc, rc; - const uint8_t* as_pack; + 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 */ + 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 */ + return -1; /* unsupported quantization */ - size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */ + if (freq >= FF_ARRAY_ELEMS(dv_audio_frequency)) + return AVERROR_INVALIDDATA; + + 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++) { + /* next stereo channel (50Mbps and 100Mbps only) */ + pcm = ppcm[ipcm++]; + if (!pcm) + break; + /* for each DIF segment */ for (i = 0; i < sys->difseg_size; i++) { frame += 6 * 80; /* skip DIF segment header */ @@ -143,32 +158,41 @@ static int dv_extract_audio(uint8_t* frame, uint8_t* ppcm[4], 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) + 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; + /* FIXME: maybe we have to admit that DV is a + * big-endian PCM */ + pcm[of * 2] = frame[d + 1]; + pcm[of * 2 + 1] = frame[d]; + + 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 = ((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) + 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 + /* FIXME: maybe we have to admit that DV is a + * big-endian PCM */ + pcm[of * 2] = lc & 0xff; + pcm[of * 2 + 1] = lc >> 8; + of = sys->audio_shuffle[i % half_ch + half_ch][j] + + (d - 8) / 3 * sys->audio_stride; + /* FIXME: maybe we have to admit that DV is a + * big-endian PCM */ + pcm[of * 2] = rc & 0xff; + pcm[of * 2 + 1] = rc >> 8; ++d; } } @@ -176,19 +200,14 @@ static int dv_extract_audio(uint8_t* frame, uint8_t* ppcm[4], 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) +static int dv_extract_audio_info(DVDemuxContext *c, uint8_t *frame) { - const uint8_t* as_pack; + const uint8_t *as_pack; int freq, stype, smpls, quant, i, ach; as_pack = dv_extract_pack(frame, dv_audio_source); @@ -197,57 +216,70 @@ static int dv_extract_audio_info(DVDemuxContext* c, uint8_t* frame) 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 */ + 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 */ + + if (freq >= FF_ARRAY_ELEMS(dv_audio_frequency)) { + av_log(c->fctx, AV_LOG_ERROR, + "Unrecognized audio sample rate index (%d)\n", freq); + return 0; + } + + if (stype > 3) { + av_log(c->fctx, AV_LOG_ERROR, "stype %d is invalid\n", stype); + c->ach = 0; + return 0; + } /* note: ach counts PAIRS of channels (i.e. stereo channels) */ - ach = ((int[4]){ 1, 0, 2, 4})[stype]; + 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 = AVMEDIA_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 |= AV_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 (!c->ast[i]) { + c->ast[i] = avformat_new_stream(c->fctx, NULL); + if (!c->ast[i]) + break; + avpriv_set_pts_info(c->ast[i], 64, 1, 30000); + c->ast[i]->codec->codec_type = AVMEDIA_TYPE_AUDIO; + c->ast[i]->codec->codec_id = AV_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 |= AV_PKT_FLAG_KEY; + } + c->ast[i]->codec->sample_rate = dv_audio_frequency[freq]; + c->ast[i]->codec->channels = 2; + c->ast[i]->codec->channel_layout = AV_CH_LAYOUT_STEREO; + 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 */; + return (c->sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */ } -static int dv_extract_video_info(DVDemuxContext *c, uint8_t* frame) +static int dv_extract_video_info(DVDemuxContext *c, uint8_t *frame) { - const uint8_t* vsc_pack; - AVCodecContext* avctx; + 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; + avpriv_set_pts_info(c->vst, 64, c->sys->time_base.num, + c->sys->time_base.den); + c->vst->avg_frame_rate = av_inv_q(c->vst->time_base); + if (!avctx->width) { + avctx->width = c->sys->width; avctx->height = c->sys->height; } avctx->pix_fmt = c->sys->pix_fmt; @@ -256,20 +288,19 @@ static int dv_extract_video_info(DVDemuxContext *c, uint8_t* frame) 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))); + (!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}, + 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 - */ +/* The following 3 functions constitute our interface to the world */ -DVDemuxContext* dv_init_demux(AVFormatContext *s) +DVDemuxContext *avpriv_dv_init_demux(AVFormatContext *s) { DVDemuxContext *c; @@ -277,65 +308,61 @@ DVDemuxContext* dv_init_demux(AVFormatContext *s) if (!c) return NULL; - c->vst = av_new_stream(s, 0); + c->vst = avformat_new_stream(s, NULL); if (!c->vst) { av_free(c); return NULL; } - c->sys = NULL; - c->fctx = s; - memset(c->ast, 0, sizeof(c->ast)); - c->ach = 0; - c->frames = 0; - c->abytes = 0; - + c->fctx = s; c->vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; - c->vst->codec->codec_id = CODEC_ID_DVVIDEO; + c->vst->codec->codec_id = AV_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 avpriv_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; - } + 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 avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt, + uint8_t *buf, int buf_size) { int size, i; - uint8_t *ppcm[4] = {0}; + uint8_t *ppcm[5] = { 0 }; if (buf_size < DV_PROFILE_BYTES || - !(c->sys = ff_dv_frame_profile(c->sys, buf, buf_size)) || + !(c->sys = av_dv_frame_profile(c->sys, buf, buf_size)) || buf_size < c->sys->frame_size) { - return -1; /* Broken frame, or not enough data */ + 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]; + 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); + if (c->ach) + 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. */ @@ -344,7 +371,7 @@ int dv_produce_packet(DVDemuxContext *c, AVPacket *pkt, 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; + c->abytes += size; } } else { c->abytes += size; @@ -356,7 +383,7 @@ int dv_produce_packet(DVDemuxContext *c, AVPacket *pkt, pkt->data = buf; pkt->size = size; pkt->flags |= AV_PKT_FLAG_KEY; - pkt->stream_index = c->vst->id; + pkt->stream_index = c->vst->index; pkt->pts = c->frames; c->frames++; @@ -365,28 +392,32 @@ int dv_produce_packet(DVDemuxContext *c, AVPacket *pkt, } static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c, - int64_t timestamp, int flags) + int64_t timestamp, int flags) { // FIXME: sys may be wrong if last dv_read_packet() failed (buffer is junk) - const DVprofile* sys = ff_dv_codec_profile(c->vst->codec); + const AVDVProfile *sys = av_dv_codec_profile(c->vst->codec->width, c->vst->codec->height, + c->vst->codec->pix_fmt); int64_t offset; - int64_t size = url_fsize(s->pb) - s->data_offset; - int64_t max_offset = ((size-1) / sys->frame_size) * sys->frame_size; + int64_t size = avio_size(s->pb) - s->internal->data_offset; + int64_t max_offset = ((size - 1) / sys->frame_size) * sys->frame_size; offset = sys->frame_size * timestamp; - if (size >= 0 && offset > max_offset) offset = max_offset; - else if (offset < 0) offset = 0; + if (size >= 0 && offset > max_offset) + offset = max_offset; + else if (offset < 0) + offset = 0; - return offset + s->data_offset; + return offset + s->internal->data_offset; } -void dv_offset_reset(DVDemuxContext *c, int64_t frame_offset) +void ff_dv_offset_reset(DVDemuxContext *c, int64_t frame_offset) { - c->frames= 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->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; } @@ -396,29 +427,28 @@ void dv_offset_reset(DVDemuxContext *c, int64_t frame_offset) ************************************************************/ typedef struct RawDVContext { - DVDemuxContext* dv_demux; + DVDemuxContext *dv_demux; uint8_t buf[DV_MAX_FRAME_SIZE]; } RawDVContext; -static int dv_read_header(AVFormatContext *s, - AVFormatParameters *ap) +static int dv_read_header(AVFormatContext *s) { unsigned state, marker_pos = 0; RawDVContext *c = s->priv_data; - c->dv_demux = dv_init_demux(s); + c->dv_demux = avpriv_dv_init_demux(s); if (!c->dv_demux) return -1; state = avio_rb32(s->pb); while ((state & 0xffffff7f) != 0x1f07003f) { - if (url_feof(s->pb)) { + if (s->pb->eof_reached) { 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) { + marker_pos = avio_tell(s->pb); + if (state == 0xff3f0701 && avio_tell(s->pb) - marker_pos == 80) { avio_seek(s->pb, -163, SEEK_CUR); state = avio_rb32(s->pb); break; @@ -431,25 +461,28 @@ static int dv_read_header(AVFormatContext *s, avio_seek(s->pb, -DV_PROFILE_BYTES, SEEK_CUR) < 0) return AVERROR(EIO); - c->dv_demux->sys = ff_dv_frame_profile(c->dv_demux->sys, c->buf, DV_PROFILE_BYTES); + c->dv_demux->sys = av_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"); + av_log(s, AV_LOG_ERROR, + "Can't determine profile of DV input stream.\n"); return -1; } - s->bit_rate = av_rescale_q(c->dv_demux->sys->frame_size, (AVRational){8,1}, + s->bit_rate = av_rescale_q(c->dv_demux->sys->frame_size, + (AVRational) { 8, 1 }, c->dv_demux->sys->time_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); + size = avpriv_dv_get_packet(c->dv_demux, pkt); if (size < 0) { if (!c->dv_demux->sys) @@ -458,23 +491,24 @@ static int dv_read_packet(AVFormatContext *s, AVPacket *pkt) if (avio_read(s->pb, c->buf, size) <= 0) return AVERROR(EIO); - size = dv_produce_packet(c->dv_demux, pkt, c->buf, size); + size = avpriv_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) + 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); + if (avio_seek(s->pb, offset, SEEK_SET) < 0) + return -1; - offset = avio_seek(s->pb, offset, SEEK_SET); - return (offset < 0) ? offset : 0; + ff_dv_offset_reset(c, offset / c->sys->frame_size); + return 0; } static int dv_read_close(AVFormatContext *s) @@ -488,7 +522,7 @@ static int dv_probe(AVProbeData *p) { unsigned state, marker_pos = 0; int i; - int matches = 0; + int matches = 0; int secondary_matches = 0; if (p->buf_size < 5) @@ -509,24 +543,25 @@ static int dv_probe(AVProbeData *p) state = (state << 8) | p->buf[i]; } - if (matches && p->buf_size / matches < 1024*1024) { - if (matches > 4 || (secondary_matches >= 10 && p->buf_size / secondary_matches < 24000)) - return AVPROBE_SCORE_MAX*3/4; // not max to avoid dv in mov to match - return AVPROBE_SCORE_MAX/4; + if (matches && p->buf_size / matches < 1024 * 1024) { + if (matches > 4 || + (secondary_matches >= 10 && + p->buf_size / secondary_matches < 24000)) + // not max to avoid dv in mov to match + return AVPROBE_SCORE_MAX * 3 / 4; + return AVPROBE_SCORE_MAX / 4; } return 0; } -#if CONFIG_DV_DEMUXER AVInputFormat ff_dv_demuxer = { - "dv", - 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", + .name = "dv", + .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"), + .priv_data_size = sizeof(RawDVContext), + .read_probe = dv_probe, + .read_header = dv_read_header, + .read_packet = dv_read_packet, + .read_close = dv_read_close, + .read_seek = dv_read_seek, + .extensions = "dv,dif", }; -#endif