/* * GXF muxer. * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot 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 "libavutil/fifo.h" #include "avformat.h" #include "gxf.h" #include "riff.h" #define GXF_AUDIO_PACKET_SIZE 65536 typedef struct GXFStreamContext { AVCodecContext *codec; AVFifoBuffer audio_buffer; uint32_t track_type; uint32_t sample_size; uint32_t sample_rate; uint16_t media_type; uint16_t media_info; uint8_t index; int frame_rate_index; int lines_index; int fields; int iframes; int pframes; int bframes; int p_per_gop; int b_per_gop; int first_gop_closed; int64_t current_dts; int dts_delay; } GXFStreamContext; typedef struct GXFContext { uint32_t nb_frames; uint32_t material_flags; uint16_t audio_tracks; uint16_t mpeg_tracks; int64_t creation_time; uint32_t umf_start_offset; uint32_t umf_track_offset; uint32_t umf_media_offset; uint32_t umf_user_data_offset; uint32_t umf_user_data_size; uint32_t umf_length; uint16_t umf_track_size; uint16_t umf_media_size; int audio_written; int sample_rate; int flags; AVFormatContext *fc; GXFStreamContext streams[48]; } GXFContext; typedef struct GXF_Lines { int height; int index; } GXF_Lines; /* FIXME check if it is relevant */ static const GXF_Lines gxf_lines_tab[] = { { 480, 1 }, /* NTSC */ { 512, 1 }, /* NTSC + VBI */ { 576, 2 }, /* PAL */ { 608, 2 }, /* PAL + VBI */ { 1080, 4 }, { 720, 6 }, }; static const AVCodecTag gxf_media_types[] = { { CODEC_ID_MJPEG , 3 }, /* NTSC */ { CODEC_ID_MJPEG , 4 }, /* PAL */ { CODEC_ID_PCM_S24LE , 9 }, { CODEC_ID_PCM_S16LE , 10 }, { CODEC_ID_MPEG2VIDEO, 11 }, /* NTSC */ { CODEC_ID_MPEG2VIDEO, 12 }, /* PAL */ { CODEC_ID_DVVIDEO , 13 }, /* NTSC */ { CODEC_ID_DVVIDEO , 14 }, /* PAL */ { CODEC_ID_DVVIDEO , 15 }, /* 50M NTSC */ { CODEC_ID_DVVIDEO , 16 }, /* 50M PAL */ { CODEC_ID_AC3 , 17 }, //{ CODEC_ID_NONE, , 18 }, /* Non compressed 24 bit audio */ { CODEC_ID_MPEG2VIDEO, 20 }, /* MPEG HD */ { CODEC_ID_MPEG1VIDEO, 22 }, /* NTSC */ { CODEC_ID_MPEG1VIDEO, 23 }, /* PAL */ { 0, 0 }, }; #define SERVER_PATH "/space/" #define ES_NAME_PATTERN "ES." static int gxf_find_lines_index(GXFStreamContext *ctx) { int i; for (i = 0; i < 6; ++i) { if (ctx->codec->height == gxf_lines_tab[i].height) { ctx->lines_index = gxf_lines_tab[i].index; return 0; } } return -1; } static void gxf_write_padding(ByteIOContext *pb, offset_t to_pad) { for (; to_pad > 0; to_pad--) { put_byte(pb, 0); } } static offset_t updatePacketSize(ByteIOContext *pb, offset_t pos) { offset_t curpos; int size; size = url_ftell(pb) - pos; if (size % 4) { gxf_write_padding(pb, 4 - size % 4); size = url_ftell(pb) - pos; } curpos = url_ftell(pb); url_fseek(pb, pos + 6, SEEK_SET); put_be32(pb, size); url_fseek(pb, curpos, SEEK_SET); return curpos - pos; } static offset_t updateSize(ByteIOContext *pb, offset_t pos) { offset_t curpos; curpos = url_ftell(pb); url_fseek(pb, pos, SEEK_SET); put_be16(pb, curpos - pos - 2); url_fseek(pb, curpos, SEEK_SET); return curpos - pos; } static void gxf_write_packet_header(ByteIOContext *pb, pkt_type_t type) { put_be32(pb, 0); /* packet leader for synchro */ put_byte(pb, 1); put_byte(pb, type); /* map packet */ put_be32(pb, 0); /* size */ put_be32(pb, 0); /* reserved */ put_byte(pb, 0xE1); /* trailer 1 */ put_byte(pb, 0xE2); /* trailer 2 */ } static int gxf_write_mpeg_auxiliary(ByteIOContext *pb, GXFStreamContext *ctx) { char buffer[1024]; int size; if (ctx->iframes) { ctx->p_per_gop = ctx->pframes / ctx->iframes; if (ctx->pframes % ctx->iframes) ctx->p_per_gop++; if (ctx->pframes) ctx->b_per_gop = ctx->bframes / ctx->pframes; if (ctx->p_per_gop > 9) ctx->p_per_gop = 9; /* ensure value won't take more than one char */ if (ctx->b_per_gop > 9) ctx->b_per_gop = 9; /* ensure value won't take more than one char */ } size = snprintf(buffer, 1024, "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n" "Pix 0\nCf %d\nCg %d\nSl 7\nnl16 %d\nVi 1\nf1 1\n", (float)ctx->codec->bit_rate, ctx->p_per_gop, ctx->b_per_gop, ctx->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1, ctx->first_gop_closed == 1, ctx->codec->height / 16); put_byte(pb, TRACK_MPG_AUX); put_byte(pb, size + 1); put_buffer(pb, (uint8_t *)buffer, size + 1); return size + 3; } static int gxf_write_timecode_auxiliary(ByteIOContext *pb, GXFStreamContext *ctx) { /* FIXME implement that */ put_byte(pb, 0); /* fields */ put_byte(pb, 0); /* seconds */ put_byte(pb, 0); /* minutes */ put_byte(pb, 0); /* flags + hours */ /* reserved */ put_be32(pb, 0); return 8; } static int gxf_write_track_description(ByteIOContext *pb, GXFStreamContext *stream) { offset_t pos; /* track description section */ put_byte(pb, stream->media_type + 0x80); put_byte(pb, stream->index + 0xC0); pos = url_ftell(pb); put_be16(pb, 0); /* size */ /* media file name */ put_byte(pb, TRACK_NAME); put_byte(pb, strlen(ES_NAME_PATTERN) + 3); put_tag(pb, ES_NAME_PATTERN); put_be16(pb, stream->media_info); put_byte(pb, 0); if (stream->codec->codec_id != CODEC_ID_MPEG2VIDEO) { /* auxiliary information */ put_byte(pb, TRACK_AUX); put_byte(pb, 8); if (stream->codec->codec_id == CODEC_ID_NONE) gxf_write_timecode_auxiliary(pb, stream); else put_le64(pb, 0); } /* file system version */ put_byte(pb, TRACK_VER); put_byte(pb, 4); put_be32(pb, 0); if (stream->codec->codec_id == CODEC_ID_MPEG2VIDEO) gxf_write_mpeg_auxiliary(pb, stream); /* frame rate */ put_byte(pb, TRACK_FPS); put_byte(pb, 4); put_be32(pb, stream->frame_rate_index); /* lines per frame */ put_byte(pb, TRACK_LINES); put_byte(pb, 4); put_be32(pb, stream->lines_index); /* fields per frame */ put_byte(pb, TRACK_FPF); put_byte(pb, 4); put_be32(pb, stream->fields); return updateSize(pb, pos); } static int gxf_write_material_data_section(ByteIOContext *pb, GXFContext *ctx) { offset_t pos; const char *filename = strrchr(ctx->fc->filename, '/'); pos = url_ftell(pb); put_be16(pb, 0); /* size */ /* name */ if (filename) filename++; else filename = ctx->fc->filename; put_byte(pb, MAT_NAME); put_byte(pb, strlen(SERVER_PATH) + strlen(filename) + 1); put_tag(pb, SERVER_PATH); put_tag(pb, filename); put_byte(pb, 0); /* first field */ put_byte(pb, MAT_FIRST_FIELD); put_byte(pb, 4); put_be32(pb, 0); /* last field */ put_byte(pb, MAT_LAST_FIELD); put_byte(pb, 4); put_be32(pb, ctx->nb_frames); /* reserved */ put_byte(pb, MAT_MARK_IN); put_byte(pb, 4); put_be32(pb, 0); put_byte(pb, MAT_MARK_OUT); put_byte(pb, 4); put_be32(pb, ctx->nb_frames); /* estimated size */ put_byte(pb, MAT_SIZE); put_byte(pb, 4); put_be32(pb, url_fsize(pb) / 1024); return updateSize(pb, pos); } static int gxf_write_track_description_section(ByteIOContext *pb, GXFContext *ctx) { offset_t pos; int i; pos = url_ftell(pb); put_be16(pb, 0); /* size */ for (i = 0; i < ctx->fc->nb_streams; ++i) gxf_write_track_description(pb, &ctx->streams[i]); return updateSize(pb, pos); } static int gxf_write_map_packet(ByteIOContext *pb, GXFContext *ctx) { offset_t pos = url_ftell(pb); gxf_write_packet_header(pb, PKT_MAP); /* preamble */ put_byte(pb, 0xE0); /* version */ put_byte(pb, 0xFF); /* reserved */ gxf_write_material_data_section(pb, ctx); gxf_write_track_description_section(pb, ctx); return updatePacketSize(pb, pos); } #if 0 static int gxf_write_flt_packet(ByteIOContext *pb, GXFContext *ctx) { offset_t pos = url_ftell(pb); int i; gxf_write_packet_header(pb, PKT_FLT); put_le32(pb, 1000); /* number of fields */ put_le32(pb, 0); /* number of active flt entries */ for (i = 0; i < 1000; ++i) { put_le32(pb, 0); } return updatePacketSize(pb, pos); } #endif static int gxf_write_umf_material_description(ByteIOContext *pb, GXFContext *ctx) { put_le32(pb, ctx->flags); put_le32(pb, ctx->nb_frames); /* length of the longest track */ put_le32(pb, ctx->nb_frames); /* length of the shortest track */ put_le32(pb, 0); /* mark in */ put_le32(pb, ctx->nb_frames); /* mark out */ put_le32(pb, 0); /* timecode mark in */ put_le32(pb, ctx->nb_frames); /* timecode mark out */ put_le64(pb, ctx->fc->timestamp); /* modification time */ put_le64(pb, ctx->fc->timestamp); /* creation time */ put_le16(pb, 0); /* reserved */ put_le16(pb, 0); /* reserved */ put_le16(pb, ctx->audio_tracks); put_le16(pb, 0); /* timecode track count */ put_le16(pb, 0); /* reserved */ put_le16(pb, ctx->mpeg_tracks); return 48; } static int gxf_write_umf_payload(ByteIOContext *pb, GXFContext *ctx) { put_le32(pb, ctx->umf_length); /* total length of the umf data */ put_le32(pb, 3); /* version */ put_le32(pb, ctx->fc->nb_streams); put_le32(pb, ctx->umf_track_offset); /* umf track section offset */ put_le32(pb, ctx->umf_track_size); put_le32(pb, ctx->fc->nb_streams); put_le32(pb, ctx->umf_media_offset); put_le32(pb, ctx->umf_media_size); put_le32(pb, ctx->umf_user_data_offset); /* user data offset */ put_le32(pb, ctx->umf_user_data_size); /* user data size */ put_le32(pb, 0); /* reserved */ put_le32(pb, 0); /* reserved */ return 48; } static int gxf_write_umf_track_description(ByteIOContext *pb, GXFContext *ctx) { offset_t pos = url_ftell(pb); int tracks[255]={0}; int i; ctx->umf_track_offset = pos - ctx->umf_start_offset; for (i = 0; i < ctx->fc->nb_streams; ++i) { AVStream *st = ctx->fc->streams[i]; GXFStreamContext *sc = &ctx->streams[i]; int id = 0; switch (st->codec->codec_id) { case CODEC_ID_MPEG1VIDEO: id= 'L'; break; case CODEC_ID_MPEG2VIDEO: id= 'M'; break; case CODEC_ID_PCM_S16LE: id= 'A'; break; case CODEC_ID_DVVIDEO: id= sc->track_type == 6 ? 'E' : 'D'; break; case CODEC_ID_MJPEG: id= 'V'; break; default: break; } sc->media_info= id << 8; /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */ sc->media_info |= '0' + (tracks[id]++); put_le16(pb, sc->media_info); put_le16(pb, 1); } return url_ftell(pb) - pos; } static int gxf_write_umf_media_mpeg(ByteIOContext *pb, GXFStreamContext *stream) { if (stream->codec->pix_fmt == PIX_FMT_YUV422P) put_le32(pb, 2); else put_le32(pb, 1); /* default to 420 */ put_le32(pb, stream->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */ put_le32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */ put_le32(pb, 1); /* I picture per GOP */ put_le32(pb, stream->p_per_gop); put_le32(pb, stream->b_per_gop); if (stream->codec->codec_id == CODEC_ID_MPEG2VIDEO) put_le32(pb, 2); else if (stream->codec->codec_id == CODEC_ID_MPEG1VIDEO) put_le32(pb, 1); else put_le32(pb, 0); put_le32(pb, 0); /* reserved */ return 32; } static int gxf_write_umf_media_timecode(ByteIOContext *pb, GXFStreamContext *track) { /* FIXME implement */ put_be32(pb, 0); /* drop frame flag */ put_be32(pb, 0); /* reserved */ put_be32(pb, 0); /* reserved */ put_be32(pb, 0); /* reserved */ put_be32(pb, 0); /* reserved */ put_be32(pb, 0); /* reserved */ put_be32(pb, 0); /* reserved */ put_be32(pb, 0); /* reserved */ return 32; } static int gxf_write_umf_media_dv(ByteIOContext *pb, GXFStreamContext *track) { int i; for (i = 0; i < 8; i++) { put_be32(pb, 0); } return 32; } static int gxf_write_umf_media_audio(ByteIOContext *pb, GXFStreamContext *track) { put_le64(pb, av_dbl2int(1)); /* sound level to begin to */ put_le64(pb, av_dbl2int(1)); /* sound level to begin to */ put_le32(pb, 0); /* number of fields over which to ramp up sound level */ put_le32(pb, 0); /* number of fields over which to ramp down sound level */ put_le32(pb, 0); /* reserved */ put_le32(pb, 0); /* reserved */ return 32; } #if 0 static int gxf_write_umf_media_mjpeg(ByteIOContext *pb, GXFStreamContext *track) { put_be64(pb, 0); /* FIXME FLOAT max chroma quant level */ put_be64(pb, 0); /* FIXME FLOAT max luma quant level */ put_be64(pb, 0); /* FIXME FLOAT min chroma quant level */ put_be64(pb, 0); /* FIXME FLOAT min luma quant level */ return 32; } #endif static int gxf_write_umf_media_description(ByteIOContext *pb, GXFContext *ctx) { offset_t pos; int i; pos = url_ftell(pb); ctx->umf_media_offset = pos - ctx->umf_start_offset; for (i = 0; i < ctx->fc->nb_streams; ++i) { GXFStreamContext *sc = &ctx->streams[i]; char buffer[88]; offset_t startpos, curpos; int path_size = strlen(ES_NAME_PATTERN); memset(buffer, 0, 88); startpos = url_ftell(pb); put_le16(pb, 0); /* length */ put_le16(pb, sc->media_info); put_le16(pb, 0); /* reserved */ put_le16(pb, 0); /* reserved */ put_le32(pb, ctx->nb_frames); put_le32(pb, 0); /* attributes rw, ro */ put_le32(pb, 0); /* mark in */ put_le32(pb, ctx->nb_frames); /* mark out */ strncpy(buffer, ES_NAME_PATTERN, path_size); put_buffer(pb, (uint8_t *)buffer, path_size); put_be16(pb, sc->media_info); put_buffer(pb, (uint8_t *)buffer + path_size + 2, 88 - path_size - 2); put_le32(pb, sc->track_type); put_le32(pb, sc->sample_rate); put_le32(pb, sc->sample_size); put_le32(pb, 0); /* reserved */ switch (sc->codec->codec_id) { case CODEC_ID_MPEG2VIDEO: gxf_write_umf_media_mpeg(pb, sc); break; case CODEC_ID_PCM_S16LE: gxf_write_umf_media_audio(pb, sc); break; case CODEC_ID_DVVIDEO: gxf_write_umf_media_dv(pb, sc); break; default: gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */ } curpos = url_ftell(pb); url_fseek(pb, startpos, SEEK_SET); put_le16(pb, curpos - startpos); url_fseek(pb, curpos, SEEK_SET); } return url_ftell(pb) - pos; } static int gxf_write_umf_user_data(ByteIOContext *pb, GXFContext *ctx) { offset_t pos = url_ftell(pb); ctx->umf_user_data_offset = pos - ctx->umf_start_offset; put_le32(pb, 20); put_le32(pb, 0); put_le16(pb, 0); put_le16(pb, 0); put_le32(pb, 0); put_byte(pb, 0); put_byte(pb, 0); put_byte(pb, 0); put_byte(pb, 0); return 20; } static int gxf_write_umf_packet(ByteIOContext *pb, GXFContext *ctx) { offset_t pos = url_ftell(pb); gxf_write_packet_header(pb, PKT_UMF); /* preamble */ put_byte(pb, 3); /* first and last (only) packet */ put_be32(pb, ctx->umf_length); /* data length */ ctx->umf_start_offset = url_ftell(pb); gxf_write_umf_payload(pb, ctx); gxf_write_umf_material_description(pb, ctx); ctx->umf_track_size = gxf_write_umf_track_description(pb, ctx); ctx->umf_media_size = gxf_write_umf_media_description(pb, ctx); ctx->umf_user_data_size = gxf_write_umf_user_data(pb, ctx); ctx->umf_length = url_ftell(pb) - ctx->umf_start_offset; return updatePacketSize(pb, pos); } #define GXF_NODELAY -5000 static int gxf_write_header(AVFormatContext *s) { ByteIOContext *pb = s->pb; GXFContext *gxf = s->priv_data; int i; gxf->fc = s; gxf->flags |= 0x00080000; /* material is simple clip */ for (i = 0; i < s->nb_streams; ++i) { AVStream *st = s->streams[i]; GXFStreamContext *sc = &gxf->streams[i]; sc->codec = st->codec; sc->index = i; sc->media_type = codec_get_tag(gxf_media_types, sc->codec->codec_id); if (st->codec->codec_type == CODEC_TYPE_AUDIO) { if (st->codec->codec_id != CODEC_ID_PCM_S16LE) { av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n"); return -1; } if (st->codec->sample_rate != 48000) { av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n"); return -1; } if (st->codec->channels != 1) { av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n"); return -1; } sc->track_type = 2; sc->sample_rate = st->codec->sample_rate; av_set_pts_info(st, 64, 1, sc->sample_rate); sc->sample_size = 16; sc->frame_rate_index = -2; sc->lines_index = -2; sc->fields = -2; gxf->audio_tracks++; gxf->flags |= 0x04000000; /* audio is 16 bit pcm */ av_fifo_init(&sc->audio_buffer, 3*GXF_AUDIO_PACKET_SIZE); } else if (sc->codec->codec_type == CODEC_TYPE_VIDEO) { /* FIXME check from time_base ? */ if (sc->codec->height == 480 || sc->codec->height == 512) { /* NTSC or NTSC+VBI */ sc->frame_rate_index = 5; sc->sample_rate = 60; gxf->flags |= 0x00000080; } else { /* assume PAL */ sc->frame_rate_index = 6; sc->media_type++; sc->sample_rate = 50; gxf->flags |= 0x00000040; } gxf->sample_rate = sc->sample_rate; av_set_pts_info(st, 64, 1, st->codec->time_base.den); sc->dts_delay = GXF_NODELAY; if (gxf_find_lines_index(sc) < 0) sc->lines_index = -1; sc->sample_size = st->codec->bit_rate; sc->fields = 2; /* interlaced */ switch (sc->codec->codec_id) { case CODEC_ID_MPEG2VIDEO: sc->first_gop_closed = -1; sc->track_type = 4; gxf->mpeg_tracks++; gxf->flags |= 0x00008000; break; case CODEC_ID_DVVIDEO: if (sc->codec->pix_fmt == PIX_FMT_YUV422P) { sc->media_type += 2; sc->track_type = 6; gxf->flags |= 0x00002000; } else { sc->track_type = 5; gxf->flags |= 0x00001000; } break; default: av_log(s, AV_LOG_ERROR, "video codec not supported\n"); return -1; } } } gxf_write_map_packet(pb, gxf); //gxf_write_flt_packet(pb, gxf); gxf_write_umf_packet(pb, gxf); put_flush_packet(pb); return 0; } static int gxf_write_eos_packet(ByteIOContext *pb, GXFContext *ctx) { offset_t pos = url_ftell(pb); gxf_write_packet_header(pb, PKT_EOS); return updatePacketSize(pb, pos); } static int gxf_write_trailer(AVFormatContext *s) { ByteIOContext *pb = s->pb; GXFContext *gxf = s->priv_data; offset_t end; int i; for (i = 0; i < s->nb_streams; ++i) { if (s->streams[i]->codec->codec_type == CODEC_TYPE_AUDIO) { av_fifo_free(&gxf->streams[i].audio_buffer); } else if (s->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO) { gxf->nb_frames = 2 * s->streams[i]->codec->frame_number; } } gxf_write_eos_packet(pb, gxf); end = url_ftell(pb); url_fseek(pb, 0, SEEK_SET); /* overwrite map and umf packets with new values */ gxf_write_map_packet(pb, gxf); //gxf_write_flt_packet(pb, gxf); gxf_write_umf_packet(pb, gxf); url_fseek(pb, end, SEEK_SET); return 0; } static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size) { uint32_t c=-1; int i; for(i=0; i<size-4 && c!=0x100; i++){ c = (c<<8) + buf[i]; if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */ sc->first_gop_closed= (buf[i+4]>>6)&1; } return (buf[i+1]>>3)&7; } static int gxf_write_media_preamble(ByteIOContext *pb, GXFContext *ctx, AVPacket *pkt, int size) { GXFStreamContext *sc = &ctx->streams[pkt->stream_index]; int64_t dts = av_rescale_rnd(pkt->dts, ctx->sample_rate, sc->codec->time_base.den, AV_ROUND_UP); put_byte(pb, sc->media_type); put_byte(pb, sc->index); put_be32(pb, dts); if (sc->codec->codec_type == CODEC_TYPE_AUDIO) { put_be16(pb, 0); put_be16(pb, size / 2); } else if (sc->codec->codec_id == CODEC_ID_MPEG2VIDEO) { int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size); if (frame_type == FF_I_TYPE) { put_byte(pb, 0x0d); sc->iframes++; } else if (frame_type == FF_B_TYPE) { put_byte(pb, 0x0f); sc->bframes++; } else { put_byte(pb, 0x0e); sc->pframes++; } put_be24(pb, size); } else if (sc->codec->codec_id == CODEC_ID_DVVIDEO) { put_byte(pb, size / 4096); put_be24(pb, 0); } else put_be32(pb, size); put_be32(pb, dts); put_byte(pb, 1); /* flags */ put_byte(pb, 0); /* reserved */ return 16; } static int gxf_write_media_packet(ByteIOContext *pb, GXFContext *ctx, AVPacket *pkt) { GXFStreamContext *sc = &ctx->streams[pkt->stream_index]; offset_t pos = url_ftell(pb); int padding = 0; gxf_write_packet_header(pb, PKT_MEDIA); if (sc->codec->codec_id == CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */ padding = 4 - pkt->size % 4; else if (sc->codec->codec_type == CODEC_TYPE_AUDIO) padding = GXF_AUDIO_PACKET_SIZE - pkt->size; gxf_write_media_preamble(pb, ctx, pkt, pkt->size + padding); put_buffer(pb, pkt->data, pkt->size); gxf_write_padding(pb, padding); return updatePacketSize(pb, pos); } static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt) { GXFContext *gxf = s->priv_data; gxf_write_media_packet(s->pb, gxf, pkt); put_flush_packet(s->pb); return 0; } static int gxf_new_audio_packet(GXFContext *gxf, GXFStreamContext *sc, AVPacket *pkt, int flush) { int size = flush ? av_fifo_size(&sc->audio_buffer) : GXF_AUDIO_PACKET_SIZE; if (!size) return 0; av_new_packet(pkt, size); av_fifo_read(&sc->audio_buffer, pkt->data, size); pkt->stream_index = sc->index; pkt->dts = sc->current_dts; sc->current_dts += size / 2; /* we only support 16 bit pcm mono for now */ return size; } static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush) { GXFContext *gxf = s->priv_data; AVPacket new_pkt; int i; for (i = 0; i < s->nb_streams; i++) { AVStream *st = s->streams[i]; GXFStreamContext *sc = &gxf->streams[i]; if (st->codec->codec_type == CODEC_TYPE_AUDIO) { if (pkt && pkt->stream_index == i) { av_fifo_generic_write(&sc->audio_buffer, pkt->data, pkt->size, NULL); pkt = NULL; } if (flush || av_fifo_size(&sc->audio_buffer) >= GXF_AUDIO_PACKET_SIZE) { if (!pkt && gxf_new_audio_packet(gxf, sc, &new_pkt, flush) > 0) { pkt = &new_pkt; break; /* add pkt right now into list */ } } } else if (pkt && pkt->stream_index == i) { if (sc->dts_delay == GXF_NODELAY) /* adjust dts if needed */ sc->dts_delay = pkt->dts; pkt->dts -= sc->dts_delay; } } return av_interleave_packet_per_dts(s, out, pkt, flush); } AVOutputFormat gxf_muxer = { "gxf", NULL_IF_CONFIG_SMALL("GXF format"), NULL, "gxf", sizeof(GXFContext), CODEC_ID_PCM_S16LE, CODEC_ID_MPEG2VIDEO, gxf_write_header, gxf_write_packet, gxf_write_trailer, 0, NULL, gxf_interleave_packet, };