mirror of
https://github.com/FFmpeg/FFmpeg.git
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d61240f8c9
Up until now, we had a PacketList structure which is actually a PacketListEntry; a proper PacketList did not exist and all the related functions just passed pointers to pointers to the head and tail elements around. All these pointers were actually consecutive elements of their containing structs, i.e. the users already treated them as if they were a struct. So add a proper PacketList struct and rename the current PacketList to PacketListEntry; also make the functions use this structure instead of the pair of pointers. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
182 lines
5.2 KiB
C
182 lines
5.2 KiB
C
/*
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* True Audio (TTA) muxer
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* Copyright (c) 2016 James Almer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/crc.h"
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#include "libavutil/intreadwrite.h"
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#include "libavcodec/packet_internal.h"
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#include "apetag.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "internal.h"
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typedef struct TTAMuxContext {
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AVIOContext *seek_table;
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PacketList queue;
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uint32_t nb_samples;
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int frame_size;
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int last_frame;
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} TTAMuxContext;
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static int tta_init(AVFormatContext *s)
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{
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TTAMuxContext *tta = s->priv_data;
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AVCodecParameters *par;
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if (s->nb_streams != 1) {
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av_log(s, AV_LOG_ERROR, "Only one stream is supported\n");
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return AVERROR(EINVAL);
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}
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par = s->streams[0]->codecpar;
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if (par->codec_id != AV_CODEC_ID_TTA) {
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av_log(s, AV_LOG_ERROR, "Unsupported codec\n");
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return AVERROR(EINVAL);
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}
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if (par->extradata && par->extradata_size < 22) {
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av_log(s, AV_LOG_ERROR, "Invalid TTA extradata\n");
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return AVERROR_INVALIDDATA;
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}
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/* Prevent overflow */
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if (par->sample_rate > 0x7FFFFFu) {
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av_log(s, AV_LOG_ERROR, "Sample rate too large\n");
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return AVERROR(EINVAL);
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}
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tta->frame_size = par->sample_rate * 256 / 245;
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avpriv_set_pts_info(s->streams[0], 64, 1, par->sample_rate);
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return 0;
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}
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static int tta_write_header(AVFormatContext *s)
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{
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TTAMuxContext *tta = s->priv_data;
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AVCodecParameters *par = s->streams[0]->codecpar;
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int ret;
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if ((ret = avio_open_dyn_buf(&tta->seek_table)) < 0)
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return ret;
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/* Ignore most extradata information if present. It can be innacurate
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if for example remuxing from Matroska */
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ffio_init_checksum(s->pb, ff_crcEDB88320_update, UINT32_MAX);
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ffio_init_checksum(tta->seek_table, ff_crcEDB88320_update, UINT32_MAX);
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avio_write(s->pb, "TTA1", 4);
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avio_wl16(s->pb, par->extradata ? AV_RL16(par->extradata + 4) : 1);
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avio_wl16(s->pb, par->channels);
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avio_wl16(s->pb, par->bits_per_raw_sample);
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avio_wl32(s->pb, par->sample_rate);
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return 0;
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}
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static int tta_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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TTAMuxContext *tta = s->priv_data;
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int ret;
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ret = avpriv_packet_list_put(&tta->queue, pkt, NULL, 0);
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if (ret < 0) {
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return ret;
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}
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pkt = &tta->queue.tail->pkt;
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avio_wl32(tta->seek_table, pkt->size);
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tta->nb_samples += pkt->duration;
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if (tta->frame_size != pkt->duration) {
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if (tta->last_frame) {
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/* Two frames with a different duration than the default frame
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size means the TTA stream comes from a faulty container, and
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there's no way the last frame duration will be correct. */
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av_log(s, AV_LOG_ERROR, "Invalid frame durations\n");
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return AVERROR_INVALIDDATA;
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}
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/* First frame with a different duration than the default frame size.
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Assume it's the last frame in the stream and continue. */
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tta->last_frame++;
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}
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return 0;
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}
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static void tta_queue_flush(AVFormatContext *s)
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{
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TTAMuxContext *tta = s->priv_data;
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AVPacket *const pkt = ffformatcontext(s)->pkt;
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while (tta->queue.head) {
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avpriv_packet_list_get(&tta->queue, pkt);
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avio_write(s->pb, pkt->data, pkt->size);
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av_packet_unref(pkt);
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}
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}
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static int tta_write_trailer(AVFormatContext *s)
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{
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TTAMuxContext *tta = s->priv_data;
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uint8_t *ptr;
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unsigned int crc;
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int size;
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avio_wl32(s->pb, tta->nb_samples);
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crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
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avio_wl32(s->pb, crc);
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/* Write Seek table */
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crc = ffio_get_checksum(tta->seek_table) ^ UINT32_MAX;
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avio_wl32(tta->seek_table, crc);
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size = avio_get_dyn_buf(tta->seek_table, &ptr);
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avio_write(s->pb, ptr, size);
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/* Write audio data */
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tta_queue_flush(s);
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ff_ape_write_tag(s);
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return 0;
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}
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static void tta_deinit(AVFormatContext *s)
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{
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TTAMuxContext *tta = s->priv_data;
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ffio_free_dyn_buf(&tta->seek_table);
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avpriv_packet_list_free(&tta->queue);
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}
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const AVOutputFormat ff_tta_muxer = {
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.name = "tta",
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.long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
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.mime_type = "audio/x-tta",
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.extensions = "tta",
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.priv_data_size = sizeof(TTAMuxContext),
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.audio_codec = AV_CODEC_ID_TTA,
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.video_codec = AV_CODEC_ID_NONE,
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.init = tta_init,
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.deinit = tta_deinit,
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.write_header = tta_write_header,
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.write_packet = tta_write_packet,
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.write_trailer = tta_write_trailer,
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};
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