| /* |
| * True Audio (TTA) muxer |
| * Copyright (c) 2016 James Almer |
| * |
| * 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/crc.h" |
| #include "libavutil/intreadwrite.h" |
| |
| #include "libavcodec/packet_internal.h" |
| #include "apetag.h" |
| #include "avformat.h" |
| #include "avio_internal.h" |
| #include "internal.h" |
| |
| typedef struct TTAMuxContext { |
| AVIOContext *seek_table; |
| AVPacketList *queue, *queue_end; |
| uint32_t nb_samples; |
| int frame_size; |
| int last_frame; |
| } TTAMuxContext; |
| |
| static int tta_init(AVFormatContext *s) |
| { |
| TTAMuxContext *tta = s->priv_data; |
| AVCodecParameters *par; |
| |
| if (s->nb_streams != 1) { |
| av_log(s, AV_LOG_ERROR, "Only one stream is supported\n"); |
| return AVERROR(EINVAL); |
| } |
| par = s->streams[0]->codecpar; |
| |
| if (par->codec_id != AV_CODEC_ID_TTA) { |
| av_log(s, AV_LOG_ERROR, "Unsupported codec\n"); |
| return AVERROR(EINVAL); |
| } |
| if (par->extradata && par->extradata_size < 22) { |
| av_log(s, AV_LOG_ERROR, "Invalid TTA extradata\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* Prevent overflow */ |
| if (par->sample_rate > 0x7FFFFFu) { |
| av_log(s, AV_LOG_ERROR, "Sample rate too large\n"); |
| return AVERROR(EINVAL); |
| } |
| tta->frame_size = par->sample_rate * 256 / 245; |
| avpriv_set_pts_info(s->streams[0], 64, 1, par->sample_rate); |
| |
| return 0; |
| } |
| |
| static int tta_write_header(AVFormatContext *s) |
| { |
| TTAMuxContext *tta = s->priv_data; |
| AVCodecParameters *par = s->streams[0]->codecpar; |
| int ret; |
| |
| if ((ret = avio_open_dyn_buf(&tta->seek_table)) < 0) |
| return ret; |
| |
| /* Ignore most extradata information if present. It can be innacurate |
| if for example remuxing from Matroska */ |
| ffio_init_checksum(s->pb, ff_crcEDB88320_update, UINT32_MAX); |
| ffio_init_checksum(tta->seek_table, ff_crcEDB88320_update, UINT32_MAX); |
| avio_write(s->pb, "TTA1", 4); |
| avio_wl16(s->pb, par->extradata ? AV_RL16(par->extradata + 4) : 1); |
| avio_wl16(s->pb, par->channels); |
| avio_wl16(s->pb, par->bits_per_raw_sample); |
| avio_wl32(s->pb, par->sample_rate); |
| |
| return 0; |
| } |
| |
| static int tta_write_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| TTAMuxContext *tta = s->priv_data; |
| int ret; |
| |
| ret = avpriv_packet_list_put(&tta->queue, &tta->queue_end, pkt, |
| av_packet_ref, 0); |
| if (ret < 0) { |
| return ret; |
| } |
| |
| avio_wl32(tta->seek_table, pkt->size); |
| tta->nb_samples += pkt->duration; |
| |
| if (tta->frame_size != pkt->duration) { |
| if (tta->last_frame) { |
| /* Two frames with a different duration than the default frame |
| size means the TTA stream comes from a faulty container, and |
| there's no way the last frame duration will be correct. */ |
| av_log(s, AV_LOG_ERROR, "Invalid frame durations\n"); |
| |
| return AVERROR_INVALIDDATA; |
| } |
| /* First frame with a different duration than the default frame size. |
| Assume it's the last frame in the stream and continue. */ |
| tta->last_frame++; |
| } |
| |
| return 0; |
| } |
| |
| static void tta_queue_flush(AVFormatContext *s) |
| { |
| TTAMuxContext *tta = s->priv_data; |
| AVPacket pkt; |
| |
| while (tta->queue) { |
| avpriv_packet_list_get(&tta->queue, &tta->queue_end, &pkt); |
| avio_write(s->pb, pkt.data, pkt.size); |
| av_packet_unref(&pkt); |
| } |
| } |
| |
| static int tta_write_trailer(AVFormatContext *s) |
| { |
| TTAMuxContext *tta = s->priv_data; |
| uint8_t *ptr; |
| unsigned int crc; |
| int size; |
| |
| avio_wl32(s->pb, tta->nb_samples); |
| crc = ffio_get_checksum(s->pb) ^ UINT32_MAX; |
| avio_wl32(s->pb, crc); |
| |
| /* Write Seek table */ |
| crc = ffio_get_checksum(tta->seek_table) ^ UINT32_MAX; |
| avio_wl32(tta->seek_table, crc); |
| size = avio_get_dyn_buf(tta->seek_table, &ptr); |
| avio_write(s->pb, ptr, size); |
| |
| /* Write audio data */ |
| tta_queue_flush(s); |
| |
| ff_ape_write_tag(s); |
| |
| return 0; |
| } |
| |
| static void tta_deinit(AVFormatContext *s) |
| { |
| TTAMuxContext *tta = s->priv_data; |
| |
| ffio_free_dyn_buf(&tta->seek_table); |
| avpriv_packet_list_free(&tta->queue, &tta->queue_end); |
| } |
| |
| AVOutputFormat ff_tta_muxer = { |
| .name = "tta", |
| .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"), |
| .mime_type = "audio/x-tta", |
| .extensions = "tta", |
| .priv_data_size = sizeof(TTAMuxContext), |
| .audio_codec = AV_CODEC_ID_TTA, |
| .video_codec = AV_CODEC_ID_NONE, |
| .init = tta_init, |
| .deinit = tta_deinit, |
| .write_header = tta_write_header, |
| .write_packet = tta_write_packet, |
| .write_trailer = tta_write_trailer, |
| }; |