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Diffstat (limited to 'ffmpeg1/libavcodec/libgsm.c')
-rw-r--r--ffmpeg1/libavcodec/libgsm.c254
1 files changed, 254 insertions, 0 deletions
diff --git a/ffmpeg1/libavcodec/libgsm.c b/ffmpeg1/libavcodec/libgsm.c
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+++ b/ffmpeg1/libavcodec/libgsm.c
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+/*
+ * Interface to libgsm for gsm encoding/decoding
+ * Copyright (c) 2005 Alban Bedel <albeu@free.fr>
+ * Copyright (c) 2006, 2007 Michel Bardiaux <mbardiaux@mediaxim.be>
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * Interface to libgsm for gsm encoding/decoding
+ */
+
+// The idiosyncrasies of GSM-in-WAV are explained at http://kbs.cs.tu-berlin.de/~jutta/toast.html
+
+#include "config.h"
+#if HAVE_GSM_H
+#include <gsm.h>
+#else
+#include <gsm/gsm.h>
+#endif
+
+#include "libavutil/channel_layout.h"
+#include "libavutil/common.h"
+#include "avcodec.h"
+#include "internal.h"
+#include "gsm.h"
+
+static av_cold int libgsm_encode_close(AVCodecContext *avctx) {
+ gsm_destroy(avctx->priv_data);
+ avctx->priv_data = NULL;
+ return 0;
+}
+
+static av_cold int libgsm_encode_init(AVCodecContext *avctx) {
+ if (avctx->channels > 1) {
+ av_log(avctx, AV_LOG_ERROR, "Mono required for GSM, got %d channels\n",
+ avctx->channels);
+ return -1;
+ }
+
+ if (avctx->sample_rate != 8000) {
+ av_log(avctx, AV_LOG_ERROR, "Sample rate 8000Hz required for GSM, got %dHz\n",
+ avctx->sample_rate);
+ if (avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL)
+ return -1;
+ }
+ if (avctx->bit_rate != 13000 /* Official */ &&
+ avctx->bit_rate != 13200 /* Very common */ &&
+ avctx->bit_rate != 0 /* Unknown; a.o. mov does not set bitrate when decoding */ ) {
+ av_log(avctx, AV_LOG_ERROR, "Bitrate 13000bps required for GSM, got %dbps\n",
+ avctx->bit_rate);
+ if (avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL)
+ return -1;
+ }
+
+ avctx->priv_data = gsm_create();
+ if (!avctx->priv_data)
+ goto error;
+
+ switch(avctx->codec_id) {
+ case AV_CODEC_ID_GSM:
+ avctx->frame_size = GSM_FRAME_SIZE;
+ avctx->block_align = GSM_BLOCK_SIZE;
+ break;
+ case AV_CODEC_ID_GSM_MS: {
+ int one = 1;
+ gsm_option(avctx->priv_data, GSM_OPT_WAV49, &one);
+ avctx->frame_size = 2*GSM_FRAME_SIZE;
+ avctx->block_align = GSM_MS_BLOCK_SIZE;
+ }
+ }
+
+ return 0;
+error:
+ libgsm_encode_close(avctx);
+ return -1;
+}
+
+static int libgsm_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
+ const AVFrame *frame, int *got_packet_ptr)
+{
+ int ret;
+ gsm_signal *samples = (gsm_signal *)frame->data[0];
+ struct gsm_state *state = avctx->priv_data;
+
+ if ((ret = ff_alloc_packet2(avctx, avpkt, avctx->block_align)) < 0)
+ return ret;
+
+ switch(avctx->codec_id) {
+ case AV_CODEC_ID_GSM:
+ gsm_encode(state, samples, avpkt->data);
+ break;
+ case AV_CODEC_ID_GSM_MS:
+ gsm_encode(state, samples, avpkt->data);
+ gsm_encode(state, samples + GSM_FRAME_SIZE, avpkt->data + 32);
+ }
+
+ *got_packet_ptr = 1;
+ return 0;
+}
+
+
+#if CONFIG_LIBGSM_ENCODER
+AVCodec ff_libgsm_encoder = {
+ .name = "libgsm",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_GSM,
+ .init = libgsm_encode_init,
+ .encode2 = libgsm_encode_frame,
+ .close = libgsm_encode_close,
+ .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
+ AV_SAMPLE_FMT_NONE },
+ .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"),
+};
+#endif
+#if CONFIG_LIBGSM_MS_ENCODER
+AVCodec ff_libgsm_ms_encoder = {
+ .name = "libgsm_ms",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_GSM_MS,
+ .init = libgsm_encode_init,
+ .encode2 = libgsm_encode_frame,
+ .close = libgsm_encode_close,
+ .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
+ AV_SAMPLE_FMT_NONE },
+ .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM Microsoft variant"),
+};
+#endif
+
+typedef struct LibGSMDecodeContext {
+ struct gsm_state *state;
+} LibGSMDecodeContext;
+
+static av_cold int libgsm_decode_init(AVCodecContext *avctx) {
+ LibGSMDecodeContext *s = avctx->priv_data;
+
+ avctx->channels = 1;
+ avctx->channel_layout = AV_CH_LAYOUT_MONO;
+ if (!avctx->sample_rate)
+ avctx->sample_rate = 8000;
+ avctx->sample_fmt = AV_SAMPLE_FMT_S16;
+
+ s->state = gsm_create();
+
+ switch(avctx->codec_id) {
+ case AV_CODEC_ID_GSM:
+ avctx->frame_size = GSM_FRAME_SIZE;
+ avctx->block_align = GSM_BLOCK_SIZE;
+ break;
+ case AV_CODEC_ID_GSM_MS: {
+ int one = 1;
+ gsm_option(s->state, GSM_OPT_WAV49, &one);
+ avctx->frame_size = 2 * GSM_FRAME_SIZE;
+ avctx->block_align = GSM_MS_BLOCK_SIZE;
+ }
+ }
+
+ return 0;
+}
+
+static av_cold int libgsm_decode_close(AVCodecContext *avctx) {
+ LibGSMDecodeContext *s = avctx->priv_data;
+
+ gsm_destroy(s->state);
+ s->state = NULL;
+ return 0;
+}
+
+static int libgsm_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame_ptr, AVPacket *avpkt)
+{
+ int i, ret;
+ LibGSMDecodeContext *s = avctx->priv_data;
+ AVFrame *frame = data;
+ uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ int16_t *samples;
+
+ if (buf_size < avctx->block_align) {
+ av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ /* get output buffer */
+ frame->nb_samples = avctx->frame_size;
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+ return ret;
+ samples = (int16_t *)frame->data[0];
+
+ for (i = 0; i < avctx->frame_size / GSM_FRAME_SIZE; i++) {
+ if ((ret = gsm_decode(s->state, buf, samples)) < 0)
+ return -1;
+ buf += GSM_BLOCK_SIZE;
+ samples += GSM_FRAME_SIZE;
+ }
+
+ *got_frame_ptr = 1;
+
+ return avctx->block_align;
+}
+
+static void libgsm_flush(AVCodecContext *avctx) {
+ LibGSMDecodeContext *s = avctx->priv_data;
+ int one = 1;
+
+ gsm_destroy(s->state);
+ s->state = gsm_create();
+ if (avctx->codec_id == AV_CODEC_ID_GSM_MS)
+ gsm_option(s->state, GSM_OPT_WAV49, &one);
+}
+
+#if CONFIG_LIBGSM_DECODER
+AVCodec ff_libgsm_decoder = {
+ .name = "libgsm",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_GSM,
+ .priv_data_size = sizeof(LibGSMDecodeContext),
+ .init = libgsm_decode_init,
+ .close = libgsm_decode_close,
+ .decode = libgsm_decode_frame,
+ .flush = libgsm_flush,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"),
+};
+#endif
+#if CONFIG_LIBGSM_MS_DECODER
+AVCodec ff_libgsm_ms_decoder = {
+ .name = "libgsm_ms",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_GSM_MS,
+ .priv_data_size = sizeof(LibGSMDecodeContext),
+ .init = libgsm_decode_init,
+ .close = libgsm_decode_close,
+ .decode = libgsm_decode_frame,
+ .flush = libgsm_flush,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM Microsoft variant"),
+};
+#endif
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