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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Interface to libshine for mp3 encoding |
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| 3 | * Copyright (c) 2012 Paul B Mahol |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include |
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| 23 | |||
| 24 | #include "libavutil/intreadwrite.h" |
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| 25 | #include "audio_frame_queue.h" |
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| 26 | #include "avcodec.h" |
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| 27 | #include "internal.h" |
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| 28 | #include "mpegaudio.h" |
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| 29 | #include "mpegaudiodecheader.h" |
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| 30 | |||
| 31 | #define BUFFER_SIZE (4096 * 20) |
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| 32 | |||
| 33 | typedef struct SHINEContext { |
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| 34 | shine_config_t config; |
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| 35 | shine_t shine; |
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| 36 | uint8_t buffer[BUFFER_SIZE]; |
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| 37 | int buffer_index; |
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| 38 | AudioFrameQueue afq; |
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| 39 | } SHINEContext; |
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| 40 | |||
| 41 | static av_cold int libshine_encode_init(AVCodecContext *avctx) |
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| 42 | { |
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| 43 | SHINEContext *s = avctx->priv_data; |
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| 44 | |||
| 45 | if (avctx->channels <= 0 || avctx->channels > 2){ |
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| 46 | av_log(avctx, AV_LOG_ERROR, "only mono or stereo is supported\n"); |
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| 47 | return AVERROR(EINVAL); |
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| 48 | } |
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| 49 | |||
| 50 | shine_set_config_mpeg_defaults(&s->config.mpeg); |
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| 51 | if (avctx->bit_rate) |
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| 52 | s->config.mpeg.bitr = avctx->bit_rate / 1000; |
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| 53 | s->config.mpeg.mode = avctx->channels == 2 ? STEREO : MONO; |
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| 54 | s->config.wave.samplerate = avctx->sample_rate; |
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| 55 | s->config.wave.channels = avctx->channels == 2 ? PCM_STEREO : PCM_MONO; |
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| 56 | if (shine_check_config(s->config.wave.samplerate, s->config.mpeg.bitr) < 0) { |
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| 57 | av_log(avctx, AV_LOG_ERROR, "invalid configuration\n"); |
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| 58 | return AVERROR(EINVAL); |
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| 59 | } |
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| 60 | s->shine = shine_initialise(&s->config); |
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| 61 | if (!s->shine) |
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| 62 | return AVERROR(ENOMEM); |
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| 63 | avctx->frame_size = shine_samples_per_pass(s->shine); |
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| 64 | ff_af_queue_init(avctx, &s->afq); |
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| 65 | return 0; |
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| 66 | } |
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| 67 | |||
| 68 | static int libshine_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, |
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| 69 | const AVFrame *frame, int *got_packet_ptr) |
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| 70 | { |
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| 71 | SHINEContext *s = avctx->priv_data; |
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| 72 | MPADecodeHeader hdr; |
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| 73 | unsigned char *data; |
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| 74 | long written; |
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| 75 | int ret, len; |
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| 76 | |||
| 77 | if (frame) |
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| 78 | data = shine_encode_buffer(s->shine, (int16_t **)frame->data, &written); |
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| 79 | else |
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| 80 | data = shine_flush(s->shine, &written); |
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| 81 | if (written < 0) |
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| 82 | return -1; |
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| 83 | if (written > 0) { |
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| 84 | if (s->buffer_index + written > BUFFER_SIZE) { |
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| 85 | av_log(avctx, AV_LOG_ERROR, "internal buffer too small\n"); |
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| 86 | return AVERROR_BUG; |
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| 87 | } |
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| 88 | memcpy(s->buffer + s->buffer_index, data, written); |
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| 89 | s->buffer_index += written; |
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| 90 | } |
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| 91 | if (frame) { |
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| 92 | if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) |
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| 93 | return ret; |
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| 94 | } |
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| 95 | |||
| 96 | if (s->buffer_index < 4 || !s->afq.frame_count) |
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| 97 | return 0; |
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| 98 | if (avpriv_mpegaudio_decode_header(&hdr, AV_RB32(s->buffer))) { |
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| 99 | av_log(avctx, AV_LOG_ERROR, "free format output not supported\n"); |
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| 100 | return -1; |
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| 101 | } |
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| 102 | |||
| 103 | len = hdr.frame_size; |
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| 104 | if (len <= s->buffer_index) { |
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| 105 | if ((ret = ff_alloc_packet2(avctx, avpkt, len))) |
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| 106 | return ret; |
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| 107 | memcpy(avpkt->data, s->buffer, len); |
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| 108 | s->buffer_index -= len; |
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| 109 | memmove(s->buffer, s->buffer + len, s->buffer_index); |
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| 110 | |||
| 111 | ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts, |
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| 112 | &avpkt->duration); |
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| 113 | |||
| 114 | avpkt->size = len; |
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| 115 | *got_packet_ptr = 1; |
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| 116 | } |
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| 117 | return 0; |
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| 118 | } |
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| 119 | |||
| 120 | static av_cold int libshine_encode_close(AVCodecContext *avctx) |
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| 121 | { |
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| 122 | SHINEContext *s = avctx->priv_data; |
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| 123 | |||
| 124 | ff_af_queue_close(&s->afq); |
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| 125 | shine_close(s->shine); |
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| 126 | return 0; |
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| 127 | } |
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| 128 | |||
| 129 | static const int libshine_sample_rates[] = { |
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| 130 | 44100, 48000, 32000, 0 |
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| 131 | }; |
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| 132 | |||
| 133 | AVCodec ff_libshine_encoder = { |
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| 134 | .name = "libshine", |
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| 135 | .long_name = NULL_IF_CONFIG_SMALL("libshine MP3 (MPEG audio layer 3)"), |
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| 136 | .type = AVMEDIA_TYPE_AUDIO, |
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| 137 | .id = CODEC_ID_MP3, |
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| 138 | .priv_data_size = sizeof(SHINEContext), |
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| 139 | .init = libshine_encode_init, |
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| 140 | .encode2 = libshine_encode_frame, |
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| 141 | .close = libshine_encode_close, |
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| 142 | .capabilities = CODEC_CAP_DELAY, |
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| 143 | .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16P, |
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| 144 | AV_SAMPLE_FMT_NONE }, |
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| 145 | .supported_samplerates = libshine_sample_rates, |
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| 146 | .channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO, |
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| 147 | AV_CH_LAYOUT_STEREO, |
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| 148 | |||
| 149 | }; |