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af_join.c
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af_join.c
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/*
* 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
* Audio join filter
*
* Join multiple audio inputs as different channels in
* a single output
*/
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "formats.h"
#include "filters.h"
#include "internal.h"
typedef struct ChannelMap {
int input; ///< input stream index
int in_channel_idx; ///< index of in_channel in the input stream data
enum AVChannel in_channel;
enum AVChannel out_channel;
} ChannelMap;
typedef struct JoinContext {
const AVClass *class;
int inputs;
char *map;
char *channel_layout_str;
AVChannelLayout ch_layout;
int64_t eof_pts;
ChannelMap *channels;
/**
* Temporary storage for input frames, until we get one on each input.
*/
AVFrame **input_frames;
/**
* Temporary storage for buffer references, for assembling the output frame.
*/
AVBufferRef **buffers;
} JoinContext;
#define OFFSET(x) offsetof(JoinContext, x)
#define A AV_OPT_FLAG_AUDIO_PARAM
#define F AV_OPT_FLAG_FILTERING_PARAM
static const AVOption join_options[] = {
{ "inputs", "Number of input streams.", OFFSET(inputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, A|F },
{ "channel_layout", "Channel layout of the "
"output stream.", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, A|F },
{ "map", "A comma-separated list of channels maps in the format "
"'input_stream.input_channel-output_channel.",
OFFSET(map), AV_OPT_TYPE_STRING, .flags = A|F },
{ NULL }
};
#define MAP_SEPARATOR '|'
AVFILTER_DEFINE_CLASS(join);
static int parse_maps(AVFilterContext *ctx)
{
JoinContext *s = ctx->priv;
char *cur = s->map;
while (cur && *cur) {
ChannelMap *map;
char *sep, *next, *p;
int input_idx, out_ch_idx;
next = strchr(cur, MAP_SEPARATOR);
if (next)
*next++ = 0;
/* split the map into input and output parts */
if (!(sep = strchr(cur, '-'))) {
av_log(ctx, AV_LOG_ERROR, "Missing separator '-' in channel "
"map '%s'\n", cur);
return AVERROR(EINVAL);
}
*sep++ = 0;
/* parse output channel */
out_ch_idx = av_channel_layout_index_from_string(&s->ch_layout, sep);
if (out_ch_idx < 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid output channel: %s.\n", sep);
return AVERROR(EINVAL);
}
map = &s->channels[out_ch_idx];
if (map->input >= 0) {
av_log(ctx, AV_LOG_ERROR, "Multiple maps for output channel "
"'%s'.\n", sep);
return AVERROR(EINVAL);
}
/* parse input channel */
input_idx = strtol(cur, &cur, 0);
if (input_idx < 0 || input_idx >= s->inputs) {
av_log(ctx, AV_LOG_ERROR, "Invalid input stream index: %d.\n",
input_idx);
return AVERROR(EINVAL);
}
if (*cur)
cur++;
map->input = input_idx;
map->in_channel = AV_CHAN_NONE;
map->in_channel_idx = strtol(cur, &p, 0);
if (p == cur) {
/* channel specifier is not a number, handle as channel name */
map->in_channel = av_channel_from_string(cur);
if (map->in_channel < 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid input channel: %s.\n", cur);
return AVERROR(EINVAL);
}
} else if (map->in_channel_idx < 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid input channel index: %d\n", map->in_channel_idx);
return AVERROR(EINVAL);
}
cur = next;
}
return 0;
}
static av_cold int join_init(AVFilterContext *ctx)
{
JoinContext *s = ctx->priv;
int ret, i;
ret = av_channel_layout_from_string(&s->ch_layout, s->channel_layout_str);
if (ret < 0) {
#if FF_API_OLD_CHANNEL_LAYOUT
uint64_t mask;
FF_DISABLE_DEPRECATION_WARNINGS
mask = av_get_channel_layout(s->channel_layout_str);
if (!mask) {
#endif
av_log(ctx, AV_LOG_ERROR, "Error parsing channel layout '%s'.\n",
s->channel_layout_str);
return AVERROR(EINVAL);
#if FF_API_OLD_CHANNEL_LAYOUT
}
FF_ENABLE_DEPRECATION_WARNINGS
av_log(ctx, AV_LOG_WARNING, "Channel layout '%s' uses a deprecated syntax.\n",
s->channel_layout_str);
av_channel_layout_from_mask(&s->ch_layout, mask);
#endif
}
s->channels = av_calloc(s->ch_layout.nb_channels, sizeof(*s->channels));
s->buffers = av_calloc(s->ch_layout.nb_channels, sizeof(*s->buffers));
s->input_frames = av_calloc(s->inputs, sizeof(*s->input_frames));
if (!s->channels || !s->buffers|| !s->input_frames)
return AVERROR(ENOMEM);
for (i = 0; i < s->ch_layout.nb_channels; i++) {
s->channels[i].out_channel = av_channel_layout_channel_from_index(&s->ch_layout, i);
s->channels[i].input = -1;
s->channels[i].in_channel_idx = -1;
s->channels[i].in_channel = AV_CHAN_NONE;
}
if ((ret = parse_maps(ctx)) < 0)
return ret;
for (i = 0; i < s->inputs; i++) {
AVFilterPad pad = { 0 };
pad.type = AVMEDIA_TYPE_AUDIO;
pad.name = av_asprintf("input%d", i);
if (!pad.name)
return AVERROR(ENOMEM);
if ((ret = ff_append_inpad_free_name(ctx, &pad)) < 0)
return ret;
}
return 0;
}
static av_cold void join_uninit(AVFilterContext *ctx)
{
JoinContext *s = ctx->priv;
int i;
for (i = 0; i < s->inputs && s->input_frames; i++) {
av_frame_free(&s->input_frames[i]);
}
av_freep(&s->channels);
av_freep(&s->buffers);
av_freep(&s->input_frames);
}
static int join_query_formats(AVFilterContext *ctx)
{
JoinContext *s = ctx->priv;
AVFilterChannelLayouts *layouts = NULL;
int i, ret;
if ((ret = ff_add_channel_layout(&layouts, &s->ch_layout)) < 0 ||
(ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->incfg.channel_layouts)) < 0)
return ret;
for (i = 0; i < ctx->nb_inputs; i++) {
layouts = ff_all_channel_layouts();
if ((ret = ff_channel_layouts_ref(layouts, &ctx->inputs[i]->outcfg.channel_layouts)) < 0)
return ret;
}
if ((ret = ff_set_common_formats(ctx, ff_planar_sample_fmts())) < 0 ||
(ret = ff_set_common_all_samplerates(ctx)) < 0)
return ret;
return 0;
}
typedef struct ChannelList {
enum AVChannel *ch;
int nb_ch;
} ChannelList;
static enum AVChannel channel_list_pop(ChannelList *chl, int idx)
{
enum AVChannel ret = chl->ch[idx];
memmove(chl->ch + idx, chl->ch + idx + 1,
(chl->nb_ch - idx - 1) * sizeof(*chl->ch));
chl->nb_ch--;
return ret;
}
/*
* If ch is present in chl, remove it from the list and return it.
* Otherwise return AV_CHAN_NONE.
*/
static enum AVChannel channel_list_pop_ch(ChannelList *chl, enum AVChannel ch)
{
for (int i = 0; i < chl->nb_ch; i++)
if (chl->ch[i] == ch)
return channel_list_pop(chl, i);
return AV_CHAN_NONE;
}
static void guess_map_matching(AVFilterContext *ctx, ChannelMap *ch,
ChannelList *inputs)
{
int i;
for (i = 0; i < ctx->nb_inputs; i++) {
if (channel_list_pop_ch(&inputs[i], ch->out_channel) != AV_CHAN_NONE) {
ch->input = i;
ch->in_channel = ch->out_channel;
return;
}
}
}
static void guess_map_any(AVFilterContext *ctx, ChannelMap *ch,
ChannelList *inputs)
{
int i;
for (i = 0; i < ctx->nb_inputs; i++) {
if (inputs[i].nb_ch) {
ch->input = i;
ch->in_channel = channel_list_pop(&inputs[i], 0);
return;
}
}
}
static int join_config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
JoinContext *s = ctx->priv;
// unused channels from each input
ChannelList *inputs_unused;
char inbuf[64], outbuf[64];
int i, ret = 0;
/* initialize unused channel list for each input */
inputs_unused = av_calloc(ctx->nb_inputs, sizeof(*inputs_unused));
if (!inputs_unused)
return AVERROR(ENOMEM);
for (i = 0; i < ctx->nb_inputs; i++) {
AVFilterLink *inlink = ctx->inputs[i];
AVChannelLayout *chl = &inlink->ch_layout;
ChannelList *iu = &inputs_unused[i];
iu->nb_ch = chl->nb_channels;
iu->ch = av_malloc_array(iu->nb_ch, sizeof(*iu->ch));
if (!iu->ch) {
ret = AVERROR(ENOMEM);
goto fail;
}
for (int ch_idx = 0; ch_idx < iu->nb_ch; ch_idx++) {
iu->ch[ch_idx] = av_channel_layout_channel_from_index(chl, ch_idx);
if (iu->ch[ch_idx] < 0) {
/* no channel ordering information in this input,
* so don't auto-map from it */
iu->nb_ch = 0;
break;
}
}
}
/* process user-specified maps */
for (i = 0; i < s->ch_layout.nb_channels; i++) {
ChannelMap *ch = &s->channels[i];
AVFilterLink *inlink;
AVChannelLayout *ichl;
ChannelList *iu;
if (ch->input < 0)
continue;
inlink = ctx->inputs[ch->input];
ichl = &inlink->ch_layout;
iu = &inputs_unused[ch->input];
/* get the index for the channels defined by name */
if (ch->in_channel != AV_CHAN_NONE) {
ch->in_channel_idx = av_channel_layout_index_from_channel(ichl, ch->in_channel);
if (ch->in_channel_idx < 0) {
av_channel_name(inbuf, sizeof(inbuf), ch->in_channel);
av_log(ctx, AV_LOG_ERROR, "Requested channel %s is not present in "
"input stream #%d.\n", inbuf,
ch->input);
ret = AVERROR(EINVAL);
goto fail;
}
}
/* make sure channels specified by index actually exist */
if (ch->in_channel_idx >= ichl->nb_channels) {
av_log(ctx, AV_LOG_ERROR, "Requested channel with index %d is not "
"present in input stream #%d.\n", ch->in_channel_idx, ch->input);
ret = AVERROR(EINVAL);
goto fail;
}
channel_list_pop_ch(iu, av_channel_layout_channel_from_index(ichl, ch->in_channel_idx));
}
/* guess channel maps when not explicitly defined */
/* first try unused matching channels */
for (i = 0; i < s->ch_layout.nb_channels; i++) {
ChannelMap *ch = &s->channels[i];
if (ch->input < 0)
guess_map_matching(ctx, ch, inputs_unused);
}
/* if the above failed, try to find _any_ unused input channel */
for (i = 0; i < s->ch_layout.nb_channels; i++) {
ChannelMap *ch = &s->channels[i];
if (ch->input < 0)
guess_map_any(ctx, ch, inputs_unused);
if (ch->input < 0) {
av_channel_name(outbuf, sizeof(outbuf), ch->out_channel);
av_log(ctx, AV_LOG_ERROR, "Could not find input channel for "
"output channel '%s'.\n",
outbuf);
ret = AVERROR(EINVAL);
goto fail;
}
if (ch->in_channel != AV_CHAN_NONE) {
ch->in_channel_idx = av_channel_layout_index_from_channel(
&ctx->inputs[ch->input]->ch_layout, ch->in_channel);
}
av_assert0(ch->in_channel_idx >= 0);
}
/* print mappings */
av_log(ctx, AV_LOG_VERBOSE, "mappings: ");
for (i = 0; i < s->ch_layout.nb_channels; i++) {
ChannelMap *ch = &s->channels[i];
AVFilterLink *inlink = ctx->inputs[ch->input];
AVChannelLayout *ichl = &inlink->ch_layout;
enum AVChannel in_ch = av_channel_layout_channel_from_index(
ichl, ch->in_channel_idx);
av_channel_name(inbuf, sizeof(inbuf), in_ch);
av_channel_name(outbuf, sizeof(outbuf), ch->out_channel);
av_log(ctx, AV_LOG_VERBOSE, "%d.%s(%d) => %s(%d) ", ch->input,
inbuf, ch->in_channel_idx,
outbuf, i);
}
av_log(ctx, AV_LOG_VERBOSE, "\n");
for (i = 0; i < ctx->nb_inputs; i++) {
if (inputs_unused[i].nb_ch == ctx->inputs[i]->ch_layout.nb_channels)
av_log(ctx, AV_LOG_WARNING, "No channels are used from input "
"stream %d.\n", i);
}
fail:
for (i = 0; i < ctx->nb_inputs; i++)
av_freep(&inputs_unused[i].ch);
av_freep(&inputs_unused);
return ret;
}
static int try_push_frame(AVFilterContext *ctx)
{
AVFilterLink *outlink = ctx->outputs[0];
JoinContext *s = ctx->priv;
AVFrame *frame;
int linesize = INT_MAX;
int nb_samples = INT_MAX;
int nb_buffers = 0;
int i, j, ret;
for (i = 0; i < ctx->nb_inputs; i++) {
if (!s->input_frames[i]) {
nb_samples = 0;
break;
} else {
nb_samples = FFMIN(nb_samples, s->input_frames[i]->nb_samples);
}
}
if (!nb_samples)
goto eof;
/* setup the output frame */
frame = av_frame_alloc();
if (!frame)
return AVERROR(ENOMEM);
if (s->ch_layout.nb_channels > FF_ARRAY_ELEMS(frame->data)) {
frame->extended_data = av_calloc(s->ch_layout.nb_channels,
sizeof(*frame->extended_data));
if (!frame->extended_data) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
/* copy the data pointers */
for (i = 0; i < s->ch_layout.nb_channels; i++) {
ChannelMap *ch = &s->channels[i];
AVFrame *cur = s->input_frames[ch->input];
AVBufferRef *buf;
frame->extended_data[i] = cur->extended_data[ch->in_channel_idx];
linesize = FFMIN(linesize, cur->linesize[0]);
/* add the buffer where this plan is stored to the list if it's
* not already there */
buf = av_frame_get_plane_buffer(cur, ch->in_channel_idx);
if (!buf) {
ret = AVERROR(EINVAL);
goto fail;
}
for (j = 0; j < nb_buffers; j++)
if (s->buffers[j]->buffer == buf->buffer)
break;
if (j == i)
s->buffers[nb_buffers++] = buf;
}
/* create references to the buffers we copied to output */
if (nb_buffers > FF_ARRAY_ELEMS(frame->buf)) {
frame->nb_extended_buf = nb_buffers - FF_ARRAY_ELEMS(frame->buf);
frame->extended_buf = av_calloc(frame->nb_extended_buf,
sizeof(*frame->extended_buf));
if (!frame->extended_buf) {
frame->nb_extended_buf = 0;
ret = AVERROR(ENOMEM);
goto fail;
}
}
for (i = 0; i < FFMIN(FF_ARRAY_ELEMS(frame->buf), nb_buffers); i++) {
frame->buf[i] = av_buffer_ref(s->buffers[i]);
if (!frame->buf[i]) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
for (i = 0; i < frame->nb_extended_buf; i++) {
frame->extended_buf[i] = av_buffer_ref(s->buffers[i +
FF_ARRAY_ELEMS(frame->buf)]);
if (!frame->extended_buf[i]) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
frame->nb_samples = nb_samples;
#if FF_API_OLD_CHANNEL_LAYOUT
FF_DISABLE_DEPRECATION_WARNINGS
frame->channel_layout = outlink->channel_layout;
frame->channels = outlink->ch_layout.nb_channels;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if ((ret = av_channel_layout_copy(&frame->ch_layout, &outlink->ch_layout)) < 0)
return ret;
frame->sample_rate = outlink->sample_rate;
frame->format = outlink->format;
frame->pts = s->input_frames[0]->pts;
frame->linesize[0] = linesize;
if (frame->data != frame->extended_data) {
memcpy(frame->data, frame->extended_data, sizeof(*frame->data) *
FFMIN(FF_ARRAY_ELEMS(frame->data), s->ch_layout.nb_channels));
}
s->eof_pts = frame->pts + av_rescale_q(frame->nb_samples,
av_make_q(1, outlink->sample_rate),
outlink->time_base);
ret = ff_filter_frame(outlink, frame);
for (i = 0; i < ctx->nb_inputs; i++)
av_frame_free(&s->input_frames[i]);
return ret;
fail:
av_frame_free(&frame);
return ret;
eof:
for (i = 0; i < ctx->nb_inputs; i++) {
if (ff_outlink_get_status(ctx->inputs[i]) &&
ff_inlink_queued_samples(ctx->inputs[i]) <= 0 &&
!s->input_frames[i]) {
ff_outlink_set_status(outlink, AVERROR_EOF, s->eof_pts);
}
}
return 0;
}
static int activate(AVFilterContext *ctx)
{
JoinContext *s = ctx->priv;
int i, ret, status;
int nb_samples = 0;
int64_t pts;
FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx);
if (!s->input_frames[0]) {
ret = ff_inlink_consume_frame(ctx->inputs[0], &s->input_frames[0]);
if (ret < 0) {
return ret;
} else if (ret == 0 && ff_inlink_acknowledge_status(ctx->inputs[0], &status, &pts)) {
ff_outlink_set_status(ctx->outputs[0], status, s->eof_pts);
return 0;
}
if (!s->input_frames[0] && ff_outlink_frame_wanted(ctx->outputs[0])) {
ff_inlink_request_frame(ctx->inputs[0]);
return 0;
}
}
if (s->input_frames[0])
nb_samples = s->input_frames[0]->nb_samples;
for (i = 1; i < ctx->nb_inputs && nb_samples > 0; i++) {
if (s->input_frames[i])
continue;
ret = ff_inlink_consume_samples(ctx->inputs[i], nb_samples, nb_samples, &s->input_frames[i]);
if (ret < 0) {
return ret;
} else if (ff_inlink_acknowledge_status(ctx->inputs[i], &status, &pts)) {
ff_outlink_set_status(ctx->outputs[0], status, pts);
return 0;
}
if (!s->input_frames[i]) {
ff_inlink_request_frame(ctx->inputs[i]);
return 0;
}
}
return try_push_frame(ctx);
}
static const AVFilterPad avfilter_af_join_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = join_config_output,
},
};
const AVFilter ff_af_join = {
.name = "join",
.description = NULL_IF_CONFIG_SMALL("Join multiple audio streams into "
"multi-channel output."),
.priv_size = sizeof(JoinContext),
.priv_class = &join_class,
.init = join_init,
.uninit = join_uninit,
.activate = activate,
.inputs = NULL,
FILTER_OUTPUTS(avfilter_af_join_outputs),
FILTER_QUERY_FUNC(join_query_formats),
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
};