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- /*
- * Raw DV format
- * Copyright (c) 2002 Fabrice Bellard.
- *
- * This library 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 of the License, or (at your option) any later version.
- *
- * This library 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include "avformat.h"
- #include "dvcore.h"
-
- typedef struct DVDemuxContext {
- int is_audio;
- uint8_t buf[144000];
- int size;
- } DVDemuxContext;
-
- /* raw input */
- static int dv_read_header(AVFormatContext *s,
- AVFormatParameters *ap)
- {
- AVStream *vst, *ast;
- DVDemuxContext *c = s->priv_data;
-
- 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;
- vst->codec.bit_rate = 25000000;
-
- ast = av_new_stream(s, 1);
- if (!ast)
- return AVERROR_NOMEM;
-
- ast->codec.codec_type = CODEC_TYPE_AUDIO;
- ast->codec.codec_id = CODEC_ID_DVAUDIO;
- c->is_audio = 0;
-
- return 0;
- }
-
- static void __destruct_pkt(struct AVPacket *pkt)
- {
- pkt->data = NULL; pkt->size = 0;
- return;
- }
-
- static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
- {
- int ret;
- DVDemuxContext *c = s->priv_data;
-
- if (!c->is_audio) {
- ret = get_buffer(&s->pb, c->buf, 4);
- if (ret <= 0)
- return -EIO;
- c->size = dv_frame_profile(&c->buf[0])->frame_size;
-
- ret = get_buffer(&s->pb, c->buf + 4, c->size - 4);
- if (ret <= 0)
- return -EIO;
- }
-
- av_init_packet(pkt);
- pkt->destruct = __destruct_pkt;
- pkt->data = c->buf;
- pkt->size = c->size;
- pkt->stream_index = c->is_audio;
- pkt->flags |= PKT_FLAG_KEY;
-
- c->is_audio = !c->is_audio;
- return c->size;
- }
-
- static int dv_read_close(AVFormatContext *s)
- {
- return 0;
- }
-
- int dv_write_header(struct AVFormatContext *s)
- {
- DVMuxContext *c = s->priv_data;
-
- if (s->nb_streams != 2 || dv_core_init(c, s->streams) != 0) {
- fprintf(stderr, "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,
- const uint8_t *buf, int size, int64_t pts)
- {
- DVMuxContext *c = s->priv_data;
-
- if (stream_index == c->vst)
- dv_assemble_frame(c, buf, NULL, 0);
- else
- dv_assemble_frame(c, NULL, buf, size);
-
- if (c->has_audio && c->has_video) {
- put_buffer(&s->pb, &c->frame_buf[0], c->sys->frame_size);
- put_flush_packet(&s->pb);
- }
-
- return 0;
- }
-
- /*
- * 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
- */
- int dv_write_trailer(struct AVFormatContext *s)
- {
- dv_core_delete((DVMuxContext *)s->priv_data);
- return 0;
- }
-
- static AVInputFormat dv_iformat = {
- "dv",
- "DV video format",
- sizeof(DVDemuxContext),
- NULL,
- dv_read_header,
- dv_read_packet,
- dv_read_close,
- .extensions = "dv",
- };
-
- AVOutputFormat dv_oformat = {
- "dv",
- "DV video format",
- NULL,
- "dv",
- sizeof(DVMuxContext),
- CODEC_ID_PCM_S16LE,
- CODEC_ID_DVVIDEO,
- dv_write_header,
- dv_write_packet,
- dv_write_trailer,
- };
-
- int dv_init(void)
- {
- av_register_input_format(&dv_iformat);
- av_register_output_format(&dv_oformat);
- return 0;
- }
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