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author | Roman Shaposhnik <roman@shaposhnik.org> | 2006-09-04 03:33:11 +0000 |
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committer | Roman Shaposhnik <roman@shaposhnik.org> | 2006-09-04 03:33:11 +0000 |
commit | 3c8f30a745ea71f2fd372e58a3f7d227c1f5d5c6 (patch) | |
tree | 2e19d5748024ba7fb0331be34f63051d343f0e78 /libavcodec | |
parent | 712ae911bbc2140860ec6d3f35317a81ecc51e2a (diff) | |
download | ffmpeg-streaming-3c8f30a745ea71f2fd372e58a3f7d227c1f5d5c6.zip ffmpeg-streaming-3c8f30a745ea71f2fd372e58a3f7d227c1f5d5c6.tar.gz |
* Restructuring the division of labor between DV codec and DV format
[ Based on a patch by Brian Brice (bbrice at newtek dot com) ]
Originally committed as revision 6161 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec')
-rw-r--r-- | libavcodec/dv.c | 137 | ||||
-rw-r--r-- | libavcodec/dvdata.h | 57 |
2 files changed, 182 insertions, 12 deletions
diff --git a/libavcodec/dv.c b/libavcodec/dv.c index 90d1018..fa2952d 100644 --- a/libavcodec/dv.c +++ b/libavcodec/dv.c @@ -1069,6 +1069,130 @@ static int dvvideo_decode_frame(AVCodecContext *avctx, return s->sys->frame_size; } + +static inline int dv_write_pack(enum dv_pack_type pack_id, DVVideoContext *c, uint8_t* buf) +{ + /* + * Here's what SMPTE314M says about these two: + * (page 6) APTn, AP1n, AP2n, AP3n: These data shall be identical + * as track application IDs (APTn = 001, AP1n = + * 001, AP2n = 001, AP3n = 001), if the source signal + * comes from a digital VCR. If the signal source is + * unknown, all bits for these data shall be set to 1. + * (page 12) STYPE: STYPE defines a signal type of video signal + * 00000b = 4:1:1 compression + * 00100b = 4:2:2 compression + * XXXXXX = Reserved + * Now, I've got two problems with these statements: + * 1. it looks like APT == 111b should be a safe bet, but it isn't. + * It seems that for PAL as defined in IEC 61834 we have to set + * APT to 000 and for SMPTE314M to 001. + * 2. It is not at all clear what STYPE is used for 4:2:0 PAL + * compression scheme (if any). + */ + int apt = (c->sys->pix_fmt == PIX_FMT_YUV420P ? 0 : 1); + int stype = (c->sys->pix_fmt == PIX_FMT_YUV422P ? 4 : 0); + + uint8_t aspect = 0; + if((int)(av_q2d(c->avctx->sample_aspect_ratio) * c->avctx->width / c->avctx->height * 10) == 17) /* 16:9 */ + aspect = 0x02; + + buf[0] = (uint8_t)pack_id; + switch (pack_id) { + case dv_header525: /* I can't imagine why these two weren't defined as real */ + case dv_header625: /* packs in SMPTE314M -- they definitely look like ones */ + buf[1] = 0xf8 | /* reserved -- always 1 */ + (apt & 0x07); /* APT: Track application ID */ + buf[2] = (0 << 7) | /* TF1: audio data is 0 - valid; 1 - invalid */ + (0x0f << 3) | /* reserved -- always 1 */ + (apt & 0x07); /* AP1: Audio application ID */ + buf[3] = (0 << 7) | /* TF2: video data is 0 - valid; 1 - invalid */ + (0x0f << 3) | /* reserved -- always 1 */ + (apt & 0x07); /* AP2: Video application ID */ + buf[4] = (0 << 7) | /* TF3: subcode(SSYB) is 0 - valid; 1 - invalid */ + (0x0f << 3) | /* reserved -- always 1 */ + (apt & 0x07); /* AP3: Subcode application ID */ + break; + case dv_video_source: + buf[1] = 0xff; /* reserved -- always 1 */ + buf[2] = (1 << 7) | /* B/W: 0 - b/w, 1 - color */ + (1 << 6) | /* following CLF is valid - 0, invalid - 1 */ + (3 << 4) | /* CLF: color frames id (see ITU-R BT.470-4) */ + 0xf; /* reserved -- always 1 */ + buf[3] = (3 << 6) | /* reserved -- always 1 */ + (c->sys->dsf << 5) | /* system: 60fields/50fields */ + stype; /* signal type video compression */ + buf[4] = 0xff; /* VISC: 0xff -- no information */ + break; + case dv_video_control: + buf[1] = (0 << 6) | /* Copy generation management (CGMS) 0 -- free */ + 0x3f; /* reserved -- always 1 */ + buf[2] = 0xc8 | /* reserved -- always b11001xxx */ + aspect; + buf[3] = (1 << 7) | /* Frame/field flag 1 -- frame, 0 -- field */ + (1 << 6) | /* First/second field flag 0 -- field 2, 1 -- field 1 */ + (1 << 5) | /* Frame change flag 0 -- same picture as before, 1 -- different */ + (1 << 4) | /* 1 - interlaced, 0 - noninterlaced */ + 0xc; /* reserved -- always b1100 */ + buf[4] = 0xff; /* reserved -- always 1 */ + break; + default: + buf[1] = buf[2] = buf[3] = buf[4] = 0xff; + } + return 5; +} + +static void dv_format_frame(DVVideoContext* c, uint8_t* buf) +{ + int chan, i, j, k; + + for (chan = 0; chan < c->sys->n_difchan; chan++) { + for (i = 0; i < c->sys->difseg_size; i++) { + memset(buf, 0xff, 80 * 6); /* First 6 DIF blocks are for control data */ + + /* DV header: 1DIF */ + buf += dv_write_dif_id(dv_sect_header, chan, i, 0, buf); + buf += dv_write_pack((c->sys->dsf ? dv_header625 : dv_header525), c, buf); + buf += 72; /* unused bytes */ + + /* DV subcode: 2DIFs */ + for (j = 0; j < 2; j++) { + buf += dv_write_dif_id(dv_sect_subcode, chan, i, j, buf); + for (k = 0; k < 6; k++) + buf += dv_write_ssyb_id(k, (i < c->sys->difseg_size/2), buf) + 5; + buf += 29; /* unused bytes */ + } + + /* DV VAUX: 3DIFS */ + for (j = 0; j < 3; j++) { + buf += dv_write_dif_id(dv_sect_vaux, chan, i, j, buf); + buf += dv_write_pack(dv_video_source, c, buf); + buf += dv_write_pack(dv_video_control, c, buf); + buf += 7*5; + buf += dv_write_pack(dv_video_source, c, buf); + buf += dv_write_pack(dv_video_control, c, buf); + buf += 4*5 + 2; /* unused bytes */ + } + + /* DV Audio/Video: 135 Video DIFs + 9 Audio DIFs */ + for (j = 0; j < 135; j++) { + if (j%15 == 0) { + memset(buf, 0xff, 80); + buf += dv_write_dif_id(dv_sect_audio, chan, i, j/15, buf); + buf += 77; /* audio control & shuffled PCM audio */ + } + buf += dv_write_dif_id(dv_sect_video, chan, i, j, buf); + buf += 77; /* 1 video macro block: 1 bytes control + 4 * 14 bytes Y 8x8 data + 10 bytes Cr 8x8 data + 10 bytes Cb 8x8 data */ + } + } + } +} + + + static int dvvideo_encode_frame(AVCodecContext *c, uint8_t *buf, int buf_size, void *data) { @@ -1091,18 +1215,7 @@ static int dvvideo_encode_frame(AVCodecContext *c, uint8_t *buf, int buf_size, emms_c(); - /* Fill in just enough of the header for dv_frame_profile() to - return the correct result, so that the frame can be decoded - correctly. The rest of the metadata is filled in by the dvvideo - avformat. (this should probably change so that encode_frame() - fills in ALL of the metadata - e.g. for Quicktime-wrapped DV - streams) */ - - /* NTSC/PAL format */ - buf[3] = s->sys->dsf ? 0x80 : 0x00; - - /* 25Mbps or 50Mbps */ - buf[80*5 + 48 + 3] = (s->sys->pix_fmt == PIX_FMT_YUV422P) ? 0x4 : 0x0; + dv_format_frame(s, buf); return s->sys->frame_size; } diff --git a/libavcodec/dvdata.h b/libavcodec/dvdata.h index a3d42d6..87d34c0 100644 --- a/libavcodec/dvdata.h +++ b/libavcodec/dvdata.h @@ -2624,6 +2624,29 @@ static const DVprofile dv_profiles[] = { } }; +enum dv_section_type { + dv_sect_header = 0x1f, + dv_sect_subcode = 0x3f, + dv_sect_vaux = 0x56, + dv_sect_audio = 0x76, + dv_sect_video = 0x96, +}; + +enum dv_pack_type { + dv_header525 = 0x3f, /* see dv_write_pack for important details on */ + dv_header625 = 0xbf, /* these two packs */ + dv_timecode = 0x13, + dv_audio_source = 0x50, + dv_audio_control = 0x51, + dv_audio_recdate = 0x52, + dv_audio_rectime = 0x53, + dv_video_source = 0x60, + dv_video_control = 0x61, + dv_video_recdate = 0x62, + dv_video_rectime = 0x63, + dv_unknown_pack = 0xff, +}; + /* minimum number of bytes to read from a DV stream in order to determine the profile */ #define DV_PROFILE_BYTES (6*80) /* 6 DIF blocks */ @@ -2663,3 +2686,37 @@ static inline const DVprofile* dv_codec_profile(AVCodecContext* codec) return NULL; } + +static inline int dv_write_dif_id(enum dv_section_type t, uint8_t chan_num, uint8_t seq_num, + uint8_t dif_num, uint8_t* buf) +{ + buf[0] = (uint8_t)t; /* Section type */ + buf[1] = (seq_num<<4) | /* DIF seq number 0-9 for 525/60; 0-11 for 625/50 */ + (chan_num << 3) | /* FSC: for 50Mb/s 0 - first channel; 1 - second */ + 7; /* reserved -- always 1 */ + buf[2] = dif_num; /* DIF block number Video: 0-134, Audio: 0-8 */ + return 3; +} + + +static inline int dv_write_ssyb_id(uint8_t syb_num, uint8_t fr, uint8_t* buf) +{ + if (syb_num == 0 || syb_num == 6) { + buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */ + (0<<4) | /* AP3 (Subcode application ID) */ + 0x0f; /* reserved -- always 1 */ + } + else if (syb_num == 11) { + buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */ + 0x7f; /* reserved -- always 1 */ + } + else { + buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */ + (0<<4) | /* APT (Track application ID) */ + 0x0f; /* reserved -- always 1 */ + } + buf[1] = 0xf0 | /* reserved -- always 1 */ + (syb_num & 0x0f); /* SSYB number 0 - 11 */ + buf[2] = 0xff; /* reserved -- always 1 */ + return 3; +} |