-/*
+/*
+ * 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.
*
*
* 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include <time.h>
#include "avformat.h"
+#include "dvdata.h"
+#include "dv.h"
-#define NTSC_FRAME_SIZE 120000
-#define PAL_FRAME_SIZE 144000
+struct DVDemuxContext {
+ AVFormatContext* fctx;
+ AVStream* vst;
+ AVStream* ast[2];
+ AVPacket audio_pkt[2];
+ uint8_t audio_buf[2][8192];
+ int ach;
+ int frames;
+ uint64_t abytes;
+};
-typedef struct DVDemuxContext {
- int is_audio;
- uint8_t buf[PAL_FRAME_SIZE];
- int size;
-} DVDemuxContext;
+struct DVMuxContext {
+ const DVprofile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
+ uint8_t frame_buf[144000]; /* frame under contruction */
+ FifoBuffer audio_data; /* Fifo for storing excessive amounts of PCM */
+ int frames; /* Number of a current frame */
+ time_t start_time; /* Start time of recording */
+ uint8_t aspect; /* Aspect ID 0 - 4:3, 7 - 16:9 */
+ int has_audio; /* frame under contruction has audio */
+ int has_video; /* frame under contruction has video */
+};
-/* raw input */
-static int dv_read_header(AVFormatContext *s,
- AVFormatParameters *ap)
+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,
+};
+
+
+
+/*
+ * The reason why the following three big ugly looking tables are
+ * here is my lack of DV spec IEC 61834. The tables were basically
+ * constructed to make code that places packs in SSYB, VAUX and
+ * AAUX blocks very simple and table-driven. They conform to the
+ * SMPTE 314M and the output of my personal DV camcorder, neither
+ * of which is sufficient for a reliable DV stream producing. Thus
+ * while code is still in development I'll be gathering input from
+ * people with different DV equipment and modifying the tables to
+ * accommodate all the quirks. Later on, if possible, some of them
+ * will be folded into smaller tables and/or switch-if logic. For
+ * now, my only excuse is -- they don't eat up that much of a space.
+ */
+
+static const int dv_ssyb_packs_dist[12][6] = {
+ { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
+ { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
+ { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
+ { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
+ { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
+ { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
+ { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
+ { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
+ { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
+ { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
+ { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
+ { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
+};
+
+static const int dv_vaux_packs_dist[12][15] = {
+ { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
+ { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
+ { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
+ { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
+ { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
+ { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
+ { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
+ { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
+ { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
+ { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
+ { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
+ { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
+};
+
+static const int dv_aaux_packs_dist[12][9] = {
+ { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
+ { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
+ { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
+ { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
+ { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
+ { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
+ { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
+ { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
+ { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
+ { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
+ { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
+ { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
+};
+
+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;
+}
+
+static int dv_audio_frame_size(const DVprofile* sys, int frame)
+{
+ return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist)/
+ sizeof(sys->audio_samples_dist[0]))];
+}
+
+static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf)
+{
+ struct tm tc;
+ time_t ct;
+ int ltc_frame;
+
+ 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 */
+ (0 & 0x07); /* APT: Track application ID */
+ buf[2] = (0 << 7) | /* TF1: audio data is 0 - valid; 1 - invalid */
+ (0x0f << 3) | /* reserved -- always 1 */
+ (0 & 0x07); /* AP1: Audio application ID */
+ buf[3] = (0 << 7) | /* TF2: video data is 0 - valid; 1 - invalid */
+ (0x0f << 3) | /* reserved -- always 1 */
+ (0 & 0x07); /* AP2: Video application ID */
+ buf[4] = (0 << 7) | /* TF3: subcode(SSYB) is 0 - valid; 1 - invalid */
+ (0x0f << 3) | /* reserved -- always 1 */
+ (0 & 0x07); /* AP3: Subcode application ID */
+ break;
+ case dv_timecode:
+ ct = (time_t)(c->frames / ((float)c->sys->frame_rate /
+ (float)c->sys->frame_rate_base));
+ brktimegm(ct, &tc);
+ /*
+ * LTC drop-frame frame counter drops two frames (0 and 1) every
+ * minute, unless it is exactly divisible by 10
+ */
+ ltc_frame = (c->frames + 2*ct/60 - 2*ct/600) % c->sys->ltc_divisor;
+ buf[1] = (0 << 7) | /* Color fame: 0 - unsync; 1 - sync mode */
+ (1 << 6) | /* Drop frame timecode: 0 - nondrop; 1 - drop */
+ ((ltc_frame / 10) << 4) | /* Tens of frames */
+ (ltc_frame % 10); /* Units of frames */
+ buf[2] = (1 << 7) | /* Biphase mark polarity correction: 0 - even; 1 - odd */
+ ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
+ (tc.tm_sec % 10); /* Units of seconds */
+ buf[3] = (1 << 7) | /* Binary group flag BGF0 */
+ ((tc.tm_min / 10) << 4) | /* Tens of minutes */
+ (tc.tm_min % 10); /* Units of minutes */
+ buf[4] = (1 << 7) | /* Binary group flag BGF2 */
+ (1 << 6) | /* Binary group flag BGF1 */
+ ((tc.tm_hour / 10) << 4) | /* Tens of hours */
+ (tc.tm_hour % 10); /* Units of hours */
+ break;
+ case dv_audio_source: /* AAUX source pack */
+ buf[1] = (0 << 7) | /* locked mode */
+ (1 << 6) | /* reserved -- always 1 */
+ (dv_audio_frame_size(c->sys, c->frames) -
+ c->sys->audio_min_samples[0]);
+ /* # of samples */
+ buf[2] = (0 << 7) | /* multi-stereo */
+ (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
+ (0 << 4) | /* pair bit: 0 -- one pair of channels */
+ 0; /* audio mode */
+ buf[3] = (1 << 7) | /* res */
+ (1 << 6) | /* multi-language flag */
+ (c->sys->dsf << 5) | /* system: 60fields/50fields */
+ 0; /* definition: 0 -- SD (525/625) */
+ buf[4] = (1 << 7) | /* emphasis: 1 -- off */
+ (0 << 6) | /* emphasis time constant: 0 -- reserved */
+ (0 << 3) | /* frequency: 0 -- 48Khz, 1 -- 44,1Khz, 2 -- 32Khz */
+ 0; /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */
+ break;
+ case dv_audio_control:
+ buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
+ (1 << 4) | /* input source: 1 -- digital input */
+ (3 << 2) | /* compression: 3 -- no information */
+ 0; /* misc. info/SMPTE emphasis off */
+ buf[2] = (1 << 7) | /* recording start point: 1 -- no */
+ (1 << 6) | /* recording end point: 1 -- no */
+ (1 << 3) | /* recording mode: 1 -- original */
+ 7;
+ buf[3] = (1 << 7) | /* direction: 1 -- forward */
+ 0x20; /* speed */
+ buf[4] = (1 << 7) | /* reserved -- always 1 */
+ 0x7f; /* genre category */
+ break;
+ case dv_audio_recdate:
+ case dv_video_recdate: /* VAUX recording date */
+ ct = c->start_time + (time_t)(c->frames /
+ ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
+ brktimegm(ct, &tc);
+ buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
+ /* 0xff is very likely to be "unknown" */
+ buf[2] = (3 << 6) | /* reserved -- always 1 */
+ ((tc.tm_mday / 10) << 4) | /* Tens of day */
+ (tc.tm_mday % 10); /* Units of day */
+ buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
+ ((tc.tm_mon / 10) << 4) | /* Tens of month */
+ (tc.tm_mon % 10); /* Units of month */
+ buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
+ (tc.tm_year % 10); /* Units of year */
+ break;
+ case dv_audio_rectime: /* AAUX recording time */
+ case dv_video_rectime: /* VAUX recording time */
+ ct = c->start_time + (time_t)(c->frames /
+ ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
+ brktimegm(ct, &tc);
+ buf[1] = (3 << 6) | /* reserved -- always 1 */
+ 0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
+ buf[2] = (1 << 7) | /* reserved -- always 1 */
+ ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
+ (tc.tm_sec % 10); /* Units of seconds */
+ buf[3] = (1 << 7) | /* reserved -- always 1 */
+ ((tc.tm_min / 10) << 4) | /* Tens of minutes */
+ (tc.tm_min % 10); /* Units of minutes */
+ buf[4] = (3 << 6) | /* reserved -- always 1 */
+ ((tc.tm_hour / 10) << 4) | /* Tens of hours */
+ (tc.tm_hour % 10); /* Units of hours */
+ 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 */
+ 0; /* 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 */
+ c->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 inline int dv_write_dif_id(enum dv_section_type t, 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 */
+ (0 << 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;
+}
+
+static void dv_format_frame(DVMuxContext *c, uint8_t* buf)
+{
+ int i, j, k;
+
+ 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, 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, i, j, buf);
+ for (k = 0; k < 6; k++) {
+ buf += dv_write_ssyb_id(k, (i < c->sys->difseg_size/2), buf);
+ buf += dv_write_pack(dv_ssyb_packs_dist[i][k], c, buf);
+ }
+ buf += 29; /* unused bytes */
+ }
+
+ /* DV VAUX: 3DIFs */
+ for (j = 0; j < 3; j++) {
+ buf += dv_write_dif_id(dv_sect_vaux, i, j, buf);
+ for (k = 0; k < 15 ; k++)
+ buf += dv_write_pack(dv_vaux_packs_dist[i][k], c, buf);
+ buf += 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, i, j/15, buf);
+ buf += 77; /* audio control & shuffled PCM audio */
+ }
+ buf += dv_write_dif_id(dv_sect_video, 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 void dv_inject_audio(DVMuxContext *c, const uint8_t* pcm, uint8_t* frame_ptr)
+{
+ int i, j, d, of, size;
+ size = 4 * dv_audio_frame_size(c->sys, c->frames);
+ for (i = 0; i < c->sys->difseg_size; i++) {
+ frame_ptr += 6 * 80; /* skip DIF segment header */
+ for (j = 0; j < 9; j++) {
+ dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3]);
+ for (d = 8; d < 80; d+=2) {
+ of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
+ if (of*2 >= size)
+ continue;
+
+ frame_ptr[d] = pcm[of*2+1]; // FIXME: may be we have to admit
+ frame_ptr[d+1] = pcm[of*2]; // that DV is a big endian PCM
+ }
+ frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
+ }
+ }
+}
+
+static void dv_inject_video(DVMuxContext *c, const uint8_t* video_data, uint8_t* frame_ptr)
+{
+ int i, j;
+ int ptr = 0;
+
+ for (i = 0; i < c->sys->difseg_size; i++) {
+ ptr += 6 * 80; /* skip DIF segment header */
+ for (j = 0; j < 135; j++) {
+ if (j%15 == 0)
+ ptr += 80; /* skip Audio DIF */
+ ptr += 3;
+ memcpy(frame_ptr + ptr, video_data + ptr, 77);
+ ptr += 77;
+ }
+ }
+}
+
+/*
+ * 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)
+{
+ int size, i, j, d, of, smpls, freq, quant, half_ch;
+ uint16_t lc, rc;
+ const DVprofile* sys;
+ const uint8_t* as_pack;
+
+ as_pack = dv_extract_pack(frame, dv_audio_source);
+ if (!as_pack) /* No audio ? */
+ return 0;
+
+ sys = dv_frame_profile(frame);
+ 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 segment */
+ for (i = 0; i < sys->difseg_size; i++) {
+ frame += 6 * 80; /* skip DIF segment header */
+ if (quant == 1 && i == half_ch) {
+ if (!pcm2)
+ break;
+ else
+ pcm = pcm2;
+ }
+
+ 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 */
+ }
+ }
+
+ return size;
+}
+
+static int dv_extract_audio_info(DVDemuxContext* c, uint8_t* frame)
+{
+ const uint8_t* as_pack;
+ const DVprofile* sys;
+ int freq, smpls, quant, i, ach;
+
+ sys = dv_frame_profile(frame);
+ as_pack = dv_extract_pack(frame, dv_audio_source);
+ if (!as_pack || !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 */
+ quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
+ ach = (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 (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */;
+}
+
+static int dv_extract_video_info(DVDemuxContext *c, uint8_t* frame)
+{
+ const DVprofile* sys;
+ const uint8_t* vsc_pack;
+ AVCodecContext* avctx;
+ int apt, is16_9;
+ int size = 0;
+
+ sys = dv_frame_profile(frame);
+ if (sys) {
+ avctx = c->vst->codec;
+
+ av_set_pts_info(c->vst, 64, sys->frame_rate_base, sys->frame_rate);
+ avctx->time_base= (AVRational){sys->frame_rate_base, sys->frame_rate};
+ if(!avctx->width){
+ avctx->width = sys->width;
+ avctx->height = sys->height;
+ }
+ avctx->pix_fmt = 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 = sys->sar[is16_9];
+
+ size = sys->frame_size;
+ }
+ return size;
+}
+
+/*
+ * The following 6 functions constitute our interface to the world
+ */
+
+int dv_assemble_frame(DVMuxContext *c, AVStream* st,
+ const uint8_t* data, int data_size, uint8_t** frame)
+{
+ uint8_t pcm[8192];
+ int fsize, reqasize;
+
+ *frame = &c->frame_buf[0];
+ if (c->has_audio && c->has_video) { /* must be a stale frame */
+ dv_format_frame(c, *frame);
+ c->frames++;
+ if (c->has_audio > 0)
+ c->has_audio = 0;
+ c->has_video = 0;
+ }
+
+ if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
+ /* FIXME: we have to have more sensible approach than this one */
+ if (c->has_video)
+ av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
+
+ dv_inject_video(c, data, *frame);
+ c->has_video = 1;
+ data_size = 0;
+ if (c->has_audio < 0)
+ goto out;
+ }
+
+ reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);
+ fsize = fifo_size(&c->audio_data, c->audio_data.rptr);
+ if (st->codec->codec_type == CODEC_TYPE_AUDIO || (c->has_video && fsize >= reqasize)) {
+ if (fsize + data_size >= reqasize && !c->has_audio) {
+ if (fsize >= reqasize) {
+ fifo_read(&c->audio_data, &pcm[0], reqasize, &c->audio_data.rptr);
+ } else {
+ fifo_read(&c->audio_data, &pcm[0], fsize, &c->audio_data.rptr);
+ memcpy(&pcm[fsize], &data[0], reqasize - fsize);
+ data += reqasize - fsize;
+ data_size -= reqasize - fsize;
+ }
+ dv_inject_audio(c, &pcm[0], *frame);
+ c->has_audio = 1;
+ }
+
+ /* FIXME: we have to have more sensible approach than this one */
+ if (fifo_size(&c->audio_data, c->audio_data.rptr) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE)
+ av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
+ fifo_write(&c->audio_data, (uint8_t *)data, data_size, &c->audio_data.wptr);
+ }
+
+out:
+ return (c->has_audio && c->has_video) ? c->sys->frame_size : 0;
+}
+
+DVMuxContext* dv_init_mux(AVFormatContext* s)
+{
+ DVMuxContext *c;
+ AVStream *vst = NULL;
+ AVStream *ast = NULL;
+ int i;
+
+ if (s->nb_streams > 2)
+ return NULL;
+
+ c = av_mallocz(sizeof(DVMuxContext));
+ if (!c)
+ return NULL;
+
+ /* We have to sort out where audio and where video stream is */
+ for (i=0; i<s->nb_streams; i++) {
+ switch (s->streams[i]->codec->codec_type) {
+ case CODEC_TYPE_VIDEO:
+ vst = s->streams[i];
+ break;
+ case CODEC_TYPE_AUDIO:
+ ast = s->streams[i];
+ break;
+ default:
+ goto bail_out;
+ }
+ }
+
+ /* Some checks -- DV format is very picky about its incoming streams */
+ if (!vst || vst->codec->codec_id != CODEC_ID_DVVIDEO)
+ goto bail_out;
+ if (ast && (ast->codec->codec_id != CODEC_ID_PCM_S16LE ||
+ ast->codec->sample_rate != 48000 ||
+ ast->codec->channels != 2))
+ goto bail_out;
+ c->sys = dv_codec_profile(vst->codec);
+ if (!c->sys)
+ goto bail_out;
+
+ /* Ok, everything seems to be in working order */
+ c->frames = 0;
+ c->has_audio = ast ? 0 : -1;
+ c->has_video = 0;
+ c->start_time = (time_t)s->timestamp;
+ c->aspect = 0; /* 4:3 is the default */
+ if ((int)(av_q2d(vst->codec->sample_aspect_ratio) * vst->codec->width / vst->codec->height * 10) == 17) /* 16:9 */
+ c->aspect = 0x07;
+
+ if (ast && fifo_init(&c->audio_data, 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0)
+ goto bail_out;
+
+ dv_format_frame(c, &c->frame_buf[0]);
+
+ return c;
+
+bail_out:
+ av_free(c);
+ return NULL;
+}
+
+void dv_delete_mux(DVMuxContext *c)
+{
+ fifo_free(&c->audio_data);
+}
+
+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->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;
+ const DVprofile* sys = dv_frame_profile(buf);
+
+ if (buf_size < 4 || buf_size < 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->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)
{
- AVStream *vst, *ast;
- DVDemuxContext *c = s->priv_data;
+ // 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.
+ ************************************************************/
- 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;
+typedef struct RawDVContext {
+ uint8_t buf[144000];
+ DVDemuxContext* dv_demux;
+} RawDVContext;
+static int dv_read_header(AVFormatContext *s,
+ AVFormatParameters *ap)
+{
+ RawDVContext *c = s->priv_data;
+ const DVprofile* sys;
+ c->dv_demux = dv_init_demux(s);
+ if (!c->dv_demux)
+ return -1;
- ast = av_new_stream(s, 1);
- if (!ast)
- return AVERROR_NOMEM;
+ if (get_buffer(&s->pb, c->buf, 4) <= 0 || url_fseek(&s->pb, -4, SEEK_CUR) < 0)
+ return AVERROR_IO;
- ast->codec.codec_type = CODEC_TYPE_AUDIO;
- ast->codec.codec_id = CODEC_ID_DVAUDIO;
- ast->codec.channels = 2;
- c->is_audio = 0;
+ sys = dv_frame_profile(c->buf);
+ s->bit_rate = av_rescale(sys->frame_size * 8, sys->frame_rate, sys->frame_rate_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;
- }
-
- 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;
+ int size;
+ RawDVContext *c = s->priv_data;
+
+ size = dv_get_packet(c->dv_demux, pkt);
+
+ if (size < 0) {
+ if (get_buffer(&s->pb, c->buf, 4) <= 0)
+ return AVERROR_IO;
+
+ size = dv_frame_profile(c->buf)->frame_size;
+ if (get_buffer(&s->pb, c->buf + 4, size - 4) <= 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);
+ const DVprofile* sys = dv_codec_profile(c->vst->codec);
+
+ c->frames= offset / sys->frame_size;
+ if (c->ach)
+ c->abytes= av_rescale(c->frames,
+ c->ast[0]->codec->bit_rate * (int64_t)sys->frame_rate_base,
+ 8*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;
}
-static AVInputFormat dv_iformat = {
- "dv",
- "DV video format",
- sizeof(DVDemuxContext),
- NULL,
- dv_read_header,
- dv_read_packet,
- dv_read_close,
- .extensions = "dv",
-};
-
-#if 0
-int dv_write_header(struct AVFormatContext *s)
+#ifdef CONFIG_MUXERS
+static int dv_write_header(AVFormatContext *s)
{
+ s->priv_data = dv_init_mux(s);
+ if (!s->priv_data) {
+ av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
+ "Make sure that you supply exactly two streams:\n"
+ " video: 25fps or 29.97fps, audio: 2ch/48Khz/PCM\n");
+ return -1;
+ }
return 0;
}
-int dv_write_packet(struct AVFormatContext *s,
- int stream_index,
- unsigned char *buf, int size, int force_pts)
+static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
{
- put_buffer(&s->pb, buf, size);
- put_flush_packet(&s->pb);
+ uint8_t* frame;
+ int fsize;
+
+ fsize = dv_assemble_frame((DVMuxContext *)s->priv_data, s->streams[pkt->stream_index],
+ pkt->data, pkt->size, &frame);
+ if (fsize > 0) {
+ put_buffer(&s->pb, frame, fsize);
+ put_flush_packet(&s->pb);
+ }
return 0;
}
-int dv_write_trailer(struct AVFormatContext *s)
+/*
+ * We might end up with some extra A/V data without matching counterpart.
+ * E.g. video data without enough audio to write the complete frame.
+ * Currently we simply drop the last frame. I don't know whether this
+ * is the best strategy of all
+ */
+static int dv_write_trailer(struct AVFormatContext *s)
{
+ dv_delete_mux((DVMuxContext *)s->priv_data);
return 0;
}
+#endif /* CONFIG_MUXERS */
+
+static AVInputFormat dv_iformat = {
+ "dv",
+ "DV video format",
+ sizeof(RawDVContext),
+ NULL,
+ dv_read_header,
+ dv_read_packet,
+ dv_read_close,
+ dv_read_seek,
+ .extensions = "dv,dif",
+};
-AVOutputFormat dv_oformat = {
+#ifdef CONFIG_MUXERS
+static AVOutputFormat dv_oformat = {
"dv",
"DV video format",
NULL,
"dv",
- 0,
+ sizeof(DVMuxContext),
+ CODEC_ID_PCM_S16LE,
CODEC_ID_DVVIDEO,
- CODEC_ID_DVAUDIO,
dv_write_header,
dv_write_packet,
dv_write_trailer,
};
#endif
-int dv_init(void)
+int ff_dv_init(void)
{
av_register_input_format(&dv_iformat);
- // av_register_output_format(&dv_oformat);
+#ifdef CONFIG_MUXERS
+ av_register_output_format(&dv_oformat);
+#endif
return 0;
}
projects / ffmpeg / blobdiff